diff --git a/RHLauncher.Forms/ChangePwdForm.cs b/RHLauncher.Forms/ChangePwdForm.cs
index 901afe3..173ec41 100644
--- a/RHLauncher.Forms/ChangePwdForm.cs
+++ b/RHLauncher.Forms/ChangePwdForm.cs
@@ -1,4 +1,5 @@
-using RHLauncher.RHLauncher.Helper;
+using Newtonsoft.Json;
+using RHLauncher.RHLauncher.Helper;
 using RHLauncher.RHLauncher.i8n;
 using System.Text.RegularExpressions;
 
@@ -8,10 +9,10 @@ namespace RHLauncher
     {
         private RegistryHandler registryHandler = new();
 
-        public string SendPasswordCodeUrl = Configuration.Default.SendPasswordCodeUrl;
-        public string VerifyCodeUrl = Configuration.Default.VerifyCodeUrl;
-        public string ChangePasswordUrl = Configuration.Default.ChangePasswordUrl;
-        public string Lang = Configuration.Default.Lang;
+        private readonly string SendPasswordCodeUrl = Configuration.Default.SendPasswordCodeUrl;
+        private readonly string VerifyCodeUrl = Configuration.Default.VerifyCodeUrl;
+        private readonly string ChangePasswordUrl = Configuration.Default.ChangePasswordUrl;
+        private readonly string Lang = Configuration.Default.Lang;
         private List<Button>? buttons;
         private List<ImageList>? imageLists;
         private Dictionary<string, List<ImageList>>? languageImageLists;
@@ -54,16 +55,16 @@ namespace RHLauncher
         private void LoadLocalizedStrings()
         {
             // Initialize buttons and image lists
-            buttons = new List<Button> { ContinueButtonS1, SendEmailButton, OkButtonS2 };
-            imageLists = new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListOKBtn };
+            buttons = [ContinueButtonS1, SendEmailButton, OkButtonS2];
+            imageLists = [imageListContinueBtn, imageListSendEmailBtn, imageListOKBtn];
 
             // Initialize language-specific image lists
             languageImageLists = new Dictionary<string, List<ImageList>>
-        {
-            { "en", new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListOKBtn } }, // English image lists
-            { "ko", new List<ImageList> { imageListContinueBtn_ko, imageListSendEmailBtn_ko, imageListOKBtn_ko } }, // Korean image lists
-            // Add other languages and their respective image lists here
-        };
+            {
+                { "en", new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListOKBtn } }, // English image lists
+                { "ko", new List<ImageList> { imageListContinueBtn_ko, imageListSendEmailBtn_ko, imageListOKBtn_ko } }, // Korean image lists
+                // Add other languages and their respective image lists here
+            };
 
             // Load the appropriate resource file based on the selected language
             LocalizationHelper.LoadLocalizedStrings(Lang, buttons, imageLists, languageImageLists);
@@ -91,12 +92,12 @@ namespace RHLauncher
         private async Task<string> SendEmailRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(SendPasswordCodeUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(SendPasswordCodeUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
 
-        }));
-
+            ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
@@ -104,45 +105,59 @@ namespace RHLauncher
         {
             Invoke((MethodInvoker)(() =>
             {
-                switch (response)
+                try
                 {
-                    case "EmailSent":
-                        SendEmailButton.Enabled = false;
-                        resendTimer.Start();
-                        break;
-                    case "ValidVerificationCode":
-                        // Hide the firs panel and show the second panel
-                        Stage1Panel.Visible = false;
-                        Stage2Panel.Visible = true;
-                        EmailLabelS2.Text = EmailTextBox.Text;
-                        CodeDescLabel.Text = "";
-                        CodePictureBox.Image = imageListTips.Images[1];
-                        break;
-                    case "PasswordChanged":
-                        MsgBoxForm.Show(LocalizedStrings.PasswordChanged, LocalizedStrings.Success);
-                        OnPasswordChanged();
-                        break;
-                    case "SamePassword":
-                        MsgBoxForm.Show(LocalizedStrings.SamePassword, LocalizedStrings.Failed);
-                        break;
-                    case "AccountNotFound":
-                        EmailDescLabel.Text = LocalizedStrings.AccountNotFound;
-                        EmailDescLabel.ForeColor = Color.Red;
-                        EmailPictureBox.Image = imageListTips.Images[0];
+                    HttpResponse? httpResponse = JsonConvert.DeserializeObject<HttpResponse>(response);
+
+                    if (httpResponse == null)
+                    {
+                        MsgBoxForm.Show(LocalizedStrings.Error + $": {LocalizedStrings.HttpResponseNull}", LocalizedStrings.Error);
                         return;
-                    case "InvalidVerificationCode":
-                        CodeDescLabel.Text = LocalizedStrings.InvalidVerificationCode;
-                        CodeDescLabel.ForeColor = Color.Red;
-                        CodePictureBox.Image = imageListTips.Images[0];
-                        return;
-                    case "ExpiredVerificationCode":
-                        CodeDescLabel.Text = LocalizedStrings.ExpiredVerificationCode;
-                        CodeDescLabel.ForeColor = Color.Red;
-                        CodePictureBox.Image = imageListTips.Images[0];
-                        return;
-                    default:
-                        MsgBoxForm.Show("Error:" + response, LocalizedStrings.Error);
-                        break;
+                    }
+
+                    switch (httpResponse.Result)
+                    {
+                        case "EmailSent":
+                            SendEmailButton.Enabled = false;
+                            resendTimer.Start();
+                            break;
+                        case "ValidVerificationCode":
+                            Stage1Panel.Visible = false;
+                            Stage2Panel.Visible = true;
+                            EmailLabelS2.Text = EmailTextBox.Text;
+                            CodeDescLabel.Text = "";
+                            CodePictureBox.Image = imageListTips.Images[1];
+                            break;
+                        case "PasswordChanged":
+                            MsgBoxForm.Show(LocalizedStrings.PasswordChanged, LocalizedStrings.Success);
+                            OnPasswordChanged();
+                            break;
+                        case "SamePassword":
+                            MsgBoxForm.Show(LocalizedStrings.SamePassword, LocalizedStrings.Failed);
+                            break;
+                        case "AccountNotFound":
+                            EmailDescLabel.Text = LocalizedStrings.AccountNotFound;
+                            EmailDescLabel.ForeColor = Color.Red;
+                            EmailPictureBox.Image = imageListTips.Images[0];
+                            break;
+                        case "InvalidVerificationCode":
+                            CodeDescLabel.Text = LocalizedStrings.InvalidVerificationCode;
+                            CodeDescLabel.ForeColor = Color.Red;
+                            CodePictureBox.Image = imageListTips.Images[0];
+                            break;
+                        case "ExpiredVerificationCode":
+                            CodeDescLabel.Text = LocalizedStrings.ExpiredVerificationCode;
+                            CodeDescLabel.ForeColor = Color.Red;
+                            CodePictureBox.Image = imageListTips.Images[0];
+                            break;
+                        default:
+                            MsgBoxForm.Show($"{LocalizedStrings.Error}: " + httpResponse.Message, LocalizedStrings.Error);
+                            break;
+                    }
+                }
+                catch (JsonException)
+                {
+                    MsgBoxForm.Show(LocalizedStrings.Error + $": {LocalizedStrings.HttpResponseParseError}", LocalizedStrings.Error);
                 }
             }));
         }
@@ -167,28 +182,28 @@ namespace RHLauncher
         private async Task<string> VerifyCodeSendRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(VerifyCodeUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(VerifyCodeUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
-            new KeyValuePair<string, string>("verification_code", CodeTextBox.Text),
-            new KeyValuePair<string, string>("verification_code_type", "Password"),
-
-        }));
+            new KeyValuePair<string, string>("verificationCode", CodeTextBox.Text),
+            new KeyValuePair<string, string>("verificationCodeType", "Password"),
 
+        ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
         private async Task<string> ChangePasswordSendRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(ChangePasswordUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(ChangePasswordUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
             new KeyValuePair<string, string>("password", PasswordTextBox.Text),
-            new KeyValuePair<string, string>("verification_code", CodeTextBox.Text),
-
-        }));
+            new KeyValuePair<string, string>("verificationCode", CodeTextBox.Text),
 
+        ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
@@ -325,7 +340,7 @@ namespace RHLauncher
             string password = PasswordTextBox.Text;
 
             // Check for minimum length and maximum length
-            if (password.Length < 6 || password.Length > 16)
+            if (password.Length < 8 || password.Length > 16)
             {
                 PwdDescLabel.Text = LocalizedStrings.PwdDescLabelSize;
                 PwdDescLabel.ForeColor = Color.Red;
diff --git a/RHLauncher.Forms/ConfigForm.Designer.cs b/RHLauncher.Forms/ConfigForm.Designer.cs
index 07b6b4c..c31d1e9 100644
--- a/RHLauncher.Forms/ConfigForm.Designer.cs
+++ b/RHLauncher.Forms/ConfigForm.Designer.cs
@@ -40,6 +40,8 @@
             OkButton = new Button();
             VersionLabel = new Label();
             toolTip = new ToolTip(components);
+            ServiceLabel = new Label();
+            cbLauncherService = new ComboBox();
             SuspendLayout();
             // 
             // CloseButton
@@ -88,7 +90,7 @@
             TitleLabel.AutoEllipsis = true;
             TitleLabel.AutoSize = true;
             TitleLabel.BackColor = Color.Transparent;
-            TitleLabel.Font = new Font("Segoe UI", 11F, FontStyle.Bold, GraphicsUnit.Point);
+            TitleLabel.Font = new Font("Segoe UI", 11F, FontStyle.Bold);
             TitleLabel.ForeColor = Color.White;
             TitleLabel.ImageAlign = ContentAlignment.TopRight;
             TitleLabel.ImeMode = ImeMode.NoControl;
@@ -125,7 +127,7 @@
             LanguageLabel.AutoEllipsis = true;
             LanguageLabel.AutoSize = true;
             LanguageLabel.BackColor = Color.Transparent;
-            LanguageLabel.Font = new Font("Segoe UI", 11F, FontStyle.Bold, GraphicsUnit.Point);
+            LanguageLabel.Font = new Font("Segoe UI", 11F, FontStyle.Bold);
             LanguageLabel.ForeColor = Color.White;
             LanguageLabel.ImageAlign = ContentAlignment.TopRight;
             LanguageLabel.ImeMode = ImeMode.NoControl;
@@ -161,7 +163,7 @@
             VersionLabel.AutoSize = true;
             VersionLabel.BackColor = Color.Transparent;
             VersionLabel.Cursor = Cursors.Hand;
-            VersionLabel.Font = new Font("Segoe UI", 10F, FontStyle.Bold, GraphicsUnit.Point);
+            VersionLabel.Font = new Font("Segoe UI", 10F, FontStyle.Bold);
             VersionLabel.ForeColor = Color.White;
             VersionLabel.Location = new Point(5, 248);
             VersionLabel.Name = "VersionLabel";
@@ -171,6 +173,34 @@
             toolTip.SetToolTip(VersionLabel, "Click to open github repository");
             VersionLabel.Click += VersionLabel_Click;
             // 
+            // ServiceLabel
+            // 
+            ServiceLabel.Anchor = AnchorStyles.None;
+            ServiceLabel.AutoEllipsis = true;
+            ServiceLabel.AutoSize = true;
+            ServiceLabel.BackColor = Color.Transparent;
+            ServiceLabel.Font = new Font("Segoe UI", 11F, FontStyle.Bold);
+            ServiceLabel.ForeColor = Color.White;
+            ServiceLabel.ImageAlign = ContentAlignment.TopRight;
+            ServiceLabel.ImeMode = ImeMode.NoControl;
+            ServiceLabel.Location = new Point(294, 119);
+            ServiceLabel.Name = "ServiceLabel";
+            ServiceLabel.Size = new Size(59, 20);
+            ServiceLabel.TabIndex = 18;
+            ServiceLabel.Text = "Service";
+            ServiceLabel.TextAlign = ContentAlignment.MiddleCenter;
+            // 
+            // cbLauncherService
+            // 
+            cbLauncherService.DropDownStyle = ComboBoxStyle.DropDownList;
+            cbLauncherService.FormattingEnabled = true;
+            cbLauncherService.Items.AddRange(new object[] { "JPN", "USA", "CHN", "JPN_BETA", "USA_BETA", "CHN_BETA" });
+            cbLauncherService.Location = new Point(254, 142);
+            cbLauncherService.Name = "cbLauncherService";
+            cbLauncherService.Size = new Size(145, 23);
+            cbLauncherService.TabIndex = 17;
+            cbLauncherService.SelectedIndexChanged += CbLauncherService_SelectedIndexChanged;
+            // 
             // ConfigForm
             // 
             AutoScaleDimensions = new SizeF(7F, 15F);
@@ -178,6 +208,8 @@
             BackColor = Color.Magenta;
             BackgroundImage = (Image)resources.GetObject("$this.BackgroundImage");
             ClientSize = new Size(646, 272);
+            Controls.Add(ServiceLabel);
+            Controls.Add(cbLauncherService);
             Controls.Add(VersionLabel);
             Controls.Add(OkButton);
             Controls.Add(LanguageLabel);
@@ -210,5 +242,7 @@
         private Button OkButton;
         private Label VersionLabel;
         private ToolTip toolTip;
+        private Label ServiceLabel;
+        private ComboBox cbLauncherService;
     }
 }
\ No newline at end of file
diff --git a/RHLauncher.Forms/ConfigForm.cs b/RHLauncher.Forms/ConfigForm.cs
index 23e501d..fbcbfa0 100644
--- a/RHLauncher.Forms/ConfigForm.cs
+++ b/RHLauncher.Forms/ConfigForm.cs
@@ -1,27 +1,36 @@
 using RHLauncher.RHLauncher.i8n;
 using RHLauncher.RHLauncher.Helper;
 using System.Diagnostics;
+using System.Text;
 
 namespace RHLauncher
 {
     public partial class ConfigForm : Form
     {
-        public string Url = "https://github.com/JuniorDark/RustyHearts-Launcher";
+        private readonly RegistryHandler registryHandler = new();
+        private readonly string? installDirectory;
+
+        private readonly string Url = "https://github.com/JuniorDark/RustyHearts-Launcher";
 
         private bool languageChanged = false;
         readonly string currentLanguageCode = Configuration.Default.Lang;
 
+        private bool serviceChanged = false;
+        readonly string currentService = Configuration.Default.Service;
+
         public ConfigForm()
         {
             InitializeComponent();
-
+            installDirectory = registryHandler.GetInstallDirectory();
             string currentVersion = GetLauncherVersion.GetVersion();
             cbLauncherLanguage.SelectedItem = GetLanguageName(currentLanguageCode);
+            cbLauncherService.SelectedItem = GetServiceName(currentService);
 
             VersionLabel.Text = $"{LocalizedStrings.Version}: {currentVersion}";
             Text = LocalizedStrings.ConfigFormTitle;
             TitleLabel.Text = LocalizedStrings.Settings;
             LanguageLabel.Text = LocalizedStrings.LauncherLanguage;
+            ServiceLabel.Text = LocalizedStrings.Service;
 
         }
 
@@ -61,7 +70,7 @@ namespace RHLauncher
             {
                 "English" => "en",
                 "한국어" => "ko",
-                _ => "en", // default to English if not found
+                _ => "en",
             };
         }
 
@@ -71,40 +80,140 @@ namespace RHLauncher
             {
                 "en" => "English",
                 "ko" => "한국어",
-                _ => "English", // default to English if not found
+                _ => "English",
             };
         }
         #endregion
 
+        #region Service Methods
+
+        private void CbLauncherService_SelectedIndexChanged(object sender, EventArgs e)
+        {
+            if (cbLauncherService.SelectedItem is string selectedItem)
+            {
+                string selectedServiceCode = GetServiceCode(selectedItem);
+                if (selectedServiceCode != currentService)
+                {
+                    serviceChanged = true;
+                }
+                else
+                {
+                    serviceChanged = false;
+                }
+            }
+        }
+
+        private static string GetServiceCode(string? service)
+        {
+            return service switch
+            {
+                "USA" => "usa",
+                "JPN" => "jpn",
+                "CHN" => "chn",
+                "USA_BETA" => "usa_beta",
+                "JPN_BETA" => "jpn_beta",
+                "CHN_BETA" => "chn_beta",
+                _ => "jpn",
+            };
+        }
+
+        private static string GetServiceName(string service)
+        {
+            return service switch
+            {
+                "usa" => "USA",
+                "jpn" => "JPN",
+                "chn" => "CHN",
+                "usa_beta" => "USA_BETA",
+                "jpn_beta" => "JPN_BETA",
+                "chn_beta" => "CHN_BETA",
+                _ => "JPN",
+            };
+        }
+
+        private void UpdateServiceDatFile(string serviceCode)
+        {
+            if (string.IsNullOrEmpty(installDirectory))
+                return;
+
+            try
+            {
+                // Compute MD5 hash
+                byte[] inputBytes = Encoding.UTF8.GetBytes(serviceCode);
+                byte[] hashBytes = System.Security.Cryptography.MD5.HashData(inputBytes);
+
+                StringBuilder sb = new();
+                foreach (byte b in hashBytes)
+                {
+                    sb.Append(b.ToString("x2")); // Lowercase hex
+                }
+                string hashString = sb.ToString();
+
+                string fileContent = $"{hashString}\r\n\r\nSTAIRWAY GAMES";
+
+                // Write to Service.dat
+                string filePath = Path.Combine(installDirectory, "Service.dat");
+                File.WriteAllText(filePath, fileContent);
+
+            }
+            catch (Exception ex)
+            {
+                MessageBox.Show($"Failed to update Service.dat: {ex.Message}", LocalizedStrings.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
+            }
+        }
+
+        #endregion
+
         #region Button Click Events
         private void OkButton_Click(object sender, EventArgs e)
         {
-            if (languageChanged)
+            try
             {
-                string? selectedLanguage = cbLauncherLanguage.SelectedItem?.ToString();
-                string languageCode = GetLanguageCode(selectedLanguage);
-
-                if (languageCode != null)
+                if (languageChanged || serviceChanged)
                 {
-                    // Update the language in the INI file
-                    Configuration.Default.Lang = languageCode;
-                    Configuration.Default.iniFile.WriteValue("Launcher", "Lang", languageCode);
-
-                    DialogResult result = MsgBoxForm.ShowYN(LocalizedStrings.ChangeLanguageMessage, LocalizedStrings.Confirmation);
-
-                    if (result == DialogResult.Yes)
+                    string? selectedService = cbLauncherService.SelectedItem?.ToString();
+                    string serviceCode = GetServiceCode(selectedService);
+                    if (serviceCode != null)
                     {
-                        Invoke((MethodInvoker)(() => Close()));
-                        Task.Delay(1000).ContinueWith(_ =>
-                        {
-                            Application.Restart();
-                        });
+                        // Update the service in the INI file
+                        Configuration.Default.Service = serviceCode;
+                        Configuration.Default.iniFile.WriteValue("Info", "Service", serviceCode);
+
+                        UpdateServiceDatFile(serviceCode);
                     }
+
+                    string? selectedLanguage = cbLauncherLanguage.SelectedItem?.ToString();
+                    string languageCode = GetLanguageCode(selectedLanguage);
+
+                    if (languageCode != null)
+                    {
+                        // Update the language in the INI file
+                        Configuration.Default.Lang = languageCode;
+                        Configuration.Default.iniFile.WriteValue("Launcher", "Lang", languageCode);
+
+                        DialogResult result = MsgBoxForm.ShowYN(LocalizedStrings.ChangeLanguageMessage, LocalizedStrings.Confirmation);
+
+                        if (result == DialogResult.Yes)
+                        {
+                            Invoke((MethodInvoker)(() => Close()));
+                            Task.Delay(1000).ContinueWith(_ =>
+                            {
+                                Application.Restart();
+                            });
+                        }
+                    }
+
+
                 }
+                else
+                {
+                    Close();
+                }
+
             }
-            else
+            catch (Exception ex)
             {
-                Close();
+                MessageBox.Show($"{LocalizedStrings.Error}: {ex.Message}", LocalizedStrings.Error, MessageBoxButtons.OK, MessageBoxIcon.Error);
             }
         }
 
diff --git a/RHLauncher.Forms/ConfigForm.resx b/RHLauncher.Forms/ConfigForm.resx
index 4a2f4e5..9fd4a21 100644
--- a/RHLauncher.Forms/ConfigForm.resx
+++ b/RHLauncher.Forms/ConfigForm.resx
@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <root>
   <!--
-    Microsoft ResX Schema 
+    Microsoft ResX Schema
 
     Version 2.0
 
@@ -48,7 +48,7 @@
     value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Binary.BinaryFormatter
             : and then encoded with base64 encoding.
-    
+
     mimetype: application/x-microsoft.net.object.soap.base64
     value   : The object must be serialized with
             : System.Runtime.Serialization.Formatters.Soap.SoapFormatter
@@ -125,7 +125,7 @@
         AAEAAAD/////AQAAAAAAAAAMAgAAAEZTeXN0ZW0uV2luZG93cy5Gb3JtcywgQ3VsdHVyZT1uZXV0cmFs
         LCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5BQEAAAAmU3lzdGVtLldpbmRvd3MuRm9ybXMu
         SW1hZ2VMaXN0U3RyZWFtZXIBAAAABERhdGEHAgIAAAAJAwAAAA8DAAAA+jYAAAJNU0Z0AUkBTAIBAQMB
-        AAHQAQEB0AEBARkBAAEZAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABZAMAARkDAAEBAQABIAUAARAB
+        AAHwAQEB8AEBARkBAAEZAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABZAMAARkDAAEBAQABIAUAARAB
         JxIAARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUC
         AAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUC
         AAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUCAAH/ARUC
@@ -370,7 +370,7 @@
         AAEAAAD/////AQAAAAAAAAAMAgAAAEZTeXN0ZW0uV2luZG93cy5Gb3JtcywgQ3VsdHVyZT1uZXV0cmFs
         LCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5BQEAAAAmU3lzdGVtLldpbmRvd3MuRm9ybXMu
         SW1hZ2VMaXN0U3RyZWFtZXIBAAAABERhdGEHAgIAAAAJAwAAAA8DAAAAkGEBAAJNU0Z0AUkBTAIBAQMB
-        AAHAAQIBwAECAWcBAAElAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABnAEBAgABJQMAAQEBAAEgBQAB
+        AAHgAQIB4AECAWcBAAElAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABnAEBAgABJQMAAQEBAAEgBQAB
         MAHuEgABJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB
         /wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScB
         BwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB
@@ -1889,7 +1889,7 @@
         AAEAAAD/////AQAAAAAAAAAMAgAAAEZTeXN0ZW0uV2luZG93cy5Gb3JtcywgQ3VsdHVyZT1uZXV0cmFs
         LCBQdWJsaWNLZXlUb2tlbj1iNzdhNWM1NjE5MzRlMDg5BQEAAAAmU3lzdGVtLldpbmRvd3MuRm9ybXMu
         SW1hZ2VMaXN0U3RyZWFtZXIBAAAABERhdGEHAgIAAAAJAwAAAA8DAAAAZGYBAAJNU0Z0AUkBTAIBAQMB
-        AAHIAQIByAECAWcBAAElAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABnAEBAgABJQMAAQEBAAEgBQAB
+        AAHoAQIB6AECAWcBAAElAQAE/wEhAQAI/wFCAU0BNgcAATYDAAEoAwABnAEBAgABJQMAAQEBAAEgBQAB
         MAHuEgABJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB
         /wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScB
         BwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB/wEnAQcBAAH/AScBBwEAAf8BJwEHAQAB
@@ -3427,7 +3427,7 @@
   <data name="$this.BackgroundImage" type="System.Drawing.Bitmap, System.Drawing" mimetype="application/x-microsoft.net.object.bytearray.base64">
     <value>
         iVBORw0KGgoAAAANSUhEUgAAAoYAAAEQCAIAAACiPyLtAAAABGdBTUEAALGPC/xhBQAAAAlwSFlzAAAL
-        EgAACxIB0t1+/AAAJ5dJREFUeF7t3d2zXOV5pnFVZTCCJJXAluJ4QmypW1Bjhw8JBoT4sqfmOJkgnNRk
+        DgAACw4BQL7hQQAAJ5dJREFUeF7t3d2zXOV5pnFVZTCCJJXAluJ4QmypW1Bjhw8JBoT4sqfmOJkgnNRk
         bDAIpypnwY4NqTmfkyR/9KzevbV399a1Xt0XYffqg7vqKpX2T0sLzp5aq99Hfe1nH//77Tc++9Frn916
         7dOXfvKLv/zJP7w09eN/mH7zl3/1f3746qbpNxv/8b5P+NjP8NTPcHCTCQ95k0v/28Ob7P0Xv91NJjzk
         TSakm5zht73J3sW7N7n0v33VN5nwP3eTMwxvMuEhb3Lpf3t4k73/4re7yYSHvMmEdJMz/LY32bt49yaX
diff --git a/RHLauncher.Forms/LauncherForm.cs b/RHLauncher.Forms/LauncherForm.cs
index 4ce3bc7..a0ac2fd 100644
--- a/RHLauncher.Forms/LauncherForm.cs
+++ b/RHLauncher.Forms/LauncherForm.cs
@@ -21,8 +21,8 @@ namespace RHLauncher
     public partial class LauncherForm : Form
     {
         private RegistryHandler registryHandler = new();
-        public string? installDirectory;
-        public string? tempInstallDirectory;
+        private string? installDirectory;
+        private string? tempInstallDirectory;
         private static readonly string DefaultIniFilePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "Config.ini");
         private readonly IniFile _iniFile = new(DefaultIniFilePath);
         private readonly string _windyCode;
@@ -487,10 +487,6 @@ namespace RHLauncher
             }
         }
 
-        public class ServerStatusResponse
-        {
-            public string? Status { get; set; }
-        }
         #endregion
 
         #region Button Click Events
@@ -666,10 +662,6 @@ namespace RHLauncher
                 {
                     Process.Start("explorer.exe", installDirectory);
                 }
-                else
-                {
-
-                }
             }
             catch (Exception ex)
             {
@@ -861,9 +853,15 @@ namespace RHLauncher
                 switch (service.ToLower())
                 {
                     case "usa":
+                    case "usa_beta":
                         arguments = "server=" + Configuration.Default.GateXMLUrl;
                         break;
+                    case "jpn":
+                    case "jpn_beta":
+                        arguments = $"-serverurl{Configuration.Default.GateInfoUrl}";
+                        break;
                     case "chn":
+                    case "chn_beta":
                         arguments = $"-serverurl{Configuration.Default.GateInfoUrl} id={_windyCode} password={_password}";
                         break;
                     default:
@@ -931,7 +929,7 @@ namespace RHLauncher
                         {
                             foreach (FileInfo file in directoryInfo.GetFiles())
                             {
-                                if (file.Name.ToLower() != "launcher.exe" && file.Name.ToLower() != "config.ini")
+                                if (!file.Name.Equals("launcher.exe", StringComparison.CurrentCultureIgnoreCase) && !file.Name.Equals("config.ini", StringComparison.CurrentCultureIgnoreCase))
                                 {
                                     file.Delete();
                                 }
@@ -1056,8 +1054,8 @@ namespace RHLauncher
 
         private static Image[] LoadImages()
         {
-            return new Image[]
-            {
+            return
+            [
                 Properties.Resources.character_select_cut_angela,
                 Properties.Resources.character_select_cut_edgar,
                 Properties.Resources.character_select_cut_frantz,
@@ -1067,7 +1065,7 @@ namespace RHLauncher
                 Properties.Resources.character_select_cut_natasha,
                 Properties.Resources.character_select_cut_roselle,
                 Properties.Resources.character_select_cut_tude
-            };
+            ];
         }
 
         private static void HidePanel(Panel panel)
@@ -1093,6 +1091,7 @@ namespace RHLauncher
             Exception newLogEx = new(errorLog, ex);
             ExceptionHandler.HandleException(newEx, newLogEx);
         }
+
         #endregion
 
     }
diff --git a/RHLauncher.Forms/LoginForm.cs b/RHLauncher.Forms/LoginForm.cs
index 3a4b70a..3b522db 100644
--- a/RHLauncher.Forms/LoginForm.cs
+++ b/RHLauncher.Forms/LoginForm.cs
@@ -10,10 +10,10 @@ namespace RHLauncher
     {
         private RegistryHandler registryHandler = new();
 
-        public string windyCode = string.Empty;
-        public string password = string.Empty;
-        public string LoginUrl = Configuration.Default.LoginUrl;
-        public string Lang = Configuration.Default.Lang;
+        private string windyCode = string.Empty;
+        private string password = string.Empty;
+        private readonly string LoginUrl = Configuration.Default.LoginUrl;
+        private readonly string Lang = Configuration.Default.Lang;
         private List<Button>? buttons;
         private List<ImageList>? imageLists;
         private Dictionary<string, List<ImageList>>? languageImageLists;
@@ -42,8 +42,8 @@ namespace RHLauncher
         private void LoadLocalizedStrings()
         {
             // Initialize buttons and image lists
-            buttons = new List<Button> { LoginButton, RegisterButton };
-            imageLists = new List<ImageList> { imageListLogin, imageListRegister };
+            buttons = [LoginButton, RegisterButton];
+            imageLists = [imageListLogin, imageListRegister];
 
             // Initialize language-specific image lists
             languageImageLists = new Dictionary<string, List<ImageList>>
@@ -171,12 +171,12 @@ namespace RHLauncher
         private async Task<string> SendLoginRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(LoginUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(LoginUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("account", UsernameTextBox.Text),
             new KeyValuePair<string, string>("password", PasswordTextBox.Text)
-            }));
-
+            ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
@@ -184,52 +184,63 @@ namespace RHLauncher
         {
             try
             {
-                Dictionary<string, string>? loginResponse = JsonConvert.DeserializeObject<Dictionary<string, string>>(response);
+                var loginResponse = JsonConvert.DeserializeObject<LoginResponse>(response);
 
-                if (loginResponse != null)
+                if (loginResponse == null)
                 {
-                    if (loginResponse.TryGetValue("Result", out var result))
-                    {
-                        switch (result)
+                    MsgBoxForm.Show(LocalizedStrings.Error + $": {LocalizedStrings.HttpResponseNull}", LocalizedStrings.Error);
+                    return;
+                }
+
+                switch (loginResponse.Result)
+                {
+                    case "LoginSuccess":
+                        if (!string.IsNullOrEmpty(loginResponse.WindyCode) && !string.IsNullOrEmpty(loginResponse.Token))
                         {
-                            case "LoginSuccess":
-                                windyCode = loginResponse["WindyCode"];
-                                password = loginResponse["Token"];
-                                progressBarLogin.Visible = false;
-                                Hide();
-                                notifyIcon.Visible = false;
-                                LauncherForm launcherForm = new(windyCode, password);
-                                launcherForm.ShowDialog();
-                                break;
-                            case "InvalidCredentials":
-                                MsgBoxForm.Show(LocalizedStrings.LoginInvalidCredentials, LocalizedStrings.LoginInfoTitle);
-                                break;
-                            case "InvalidUsernameFormat":
-                                MsgBoxForm.Show(LocalizedStrings.LoginInvalidUsernameFormat, LocalizedStrings.LoginInfoTitle);
-                                break;
-                            case "AccountNotFound":
-                                MsgBoxForm.Show(LocalizedStrings.LoginInvalidCredentials, LocalizedStrings.LoginInfoTitle);
-                                break;
-                            case "Locked":
-                                MsgBoxForm.Show(LocalizedStrings.LoginLocked, LocalizedStrings.LoginInfoTitle);
-                                break;
-                            case "TooManyAttempts":
-                                MsgBoxForm.Show(LocalizedStrings.LoginTooManyAttempts, LocalizedStrings.LoginInfoTitle);
-                                break;
-                            default:
-                                MsgBoxForm.Show(LocalizedStrings.Error + result, LocalizedStrings.Error);
-                                break;
+                            windyCode = loginResponse.WindyCode;
+                            password = loginResponse.Token;
+                            progressBarLogin.Visible = false;
+                            Hide();
+                            notifyIcon.Visible = false;
+                            LauncherForm launcherForm = new(windyCode, password);
+                            launcherForm.ShowDialog();
                         }
-                    }
-                    else
-                    {
-                        MsgBoxForm.Show(LocalizedStrings.Error + "Response does not contain a Result field.", LocalizedStrings.Error);
-                    }
-                }
-                else
-                {
-                    MsgBoxForm.Show(LocalizedStrings.Error + "Failed to deserialize the response.", LocalizedStrings.Error);
+                        else
+                        {
+                            MsgBoxForm.Show(LocalizedStrings.Error + " Missing token or windyCode.", LocalizedStrings.Error);
+                        }
+                        break;
+
+                    case "InvalidCredentials":
+                    case "AccountNotFound":
+                        MsgBoxForm.Show(LocalizedStrings.LoginInvalidCredentials, LocalizedStrings.LoginInfoTitle);
+                        break;
+
+                    case "Locked":
+                        MsgBoxForm.Show(LocalizedStrings.LoginLocked, LocalizedStrings.LoginInfoTitle);
+                        break;
+
+                    case "TooManyAttempts":
+                        MsgBoxForm.Show(LocalizedStrings.LoginTooManyAttempts, LocalizedStrings.LoginInfoTitle);
+                        break;
+
+                    case "InvalidRequest":
+                    case "ServerError":
+                        if (!string.IsNullOrEmpty(loginResponse.Message))
+                        {
+                            MsgBoxForm.Show(loginResponse.Message, LocalizedStrings.Error);
+                        }
+                        else
+                        {
+                            MsgBoxForm.Show(LocalizedStrings.Error + ": " + loginResponse.Result, LocalizedStrings.Error);
+                        }
+                        break;
+
+                    default:
+                        MsgBoxForm.Show(LocalizedStrings.Error + ": " + loginResponse.Result, LocalizedStrings.Error);
+                        break;
                 }
+
             }
             catch (Exception ex)
             {
diff --git a/RHLauncher.Forms/RegisterForm.cs b/RHLauncher.Forms/RegisterForm.cs
index ac8ab50..e191824 100644
--- a/RHLauncher.Forms/RegisterForm.cs
+++ b/RHLauncher.Forms/RegisterForm.cs
@@ -1,4 +1,5 @@
-using RHLauncher.RHLauncher.Helper;
+using Newtonsoft.Json;
+using RHLauncher.RHLauncher.Helper;
 using RHLauncher.RHLauncher.i8n;
 using System.Diagnostics;
 using System.Text.RegularExpressions;
@@ -7,11 +8,11 @@ namespace RHLauncher
 {
     public partial class RegisterForm : Form
     {
-        public string SendCodeUrl = Configuration.Default.SendCodeUrl;
-        public string AgreementUrl = Configuration.Default.AgreementUrl;
-        public string VerifyCodeUrl = Configuration.Default.VerifyCodeUrl;
-        public string RegisterUrl = Configuration.Default.RegisterUrl;
-        public string Lang = Configuration.Default.Lang;
+        private readonly string SendCodeUrl = Configuration.Default.SendCodeUrl;
+        private readonly string AgreementUrl = Configuration.Default.AgreementUrl;
+        private readonly string VerifyCodeUrl = Configuration.Default.VerifyCodeUrl;
+        private readonly string RegisterUrl = Configuration.Default.RegisterUrl;
+        private readonly string Lang = Configuration.Default.Lang;
         private List<Button>? buttons;
         private List<ImageList>? imageLists;
         private Dictionary<string, List<ImageList>>? languageImageLists;
@@ -55,16 +56,16 @@ namespace RHLauncher
         private void LoadLocalizedStrings()
         {
             // Initialize buttons and image lists
-            buttons = new List<Button> { ContinueButtonS1, SendEmailButton, ContinueButtonS2 };
-            imageLists = new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListContinueBtn };
+            buttons = [ContinueButtonS1, SendEmailButton, ContinueButtonS2];
+            imageLists = [imageListContinueBtn, imageListSendEmailBtn, imageListContinueBtn];
 
             // Initialize language-specific image lists
             languageImageLists = new Dictionary<string, List<ImageList>>
-        {
-            { "en", new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListContinueBtn } }, // English image lists
-            { "ko", new List<ImageList> { imageListContinueBtn_ko, imageListSendEmailBtn_ko, imageListContinueBtn_ko } }, // Korean image lists
-            // Add other languages and their respective image lists here
-        };
+            {
+                { "en", new List<ImageList> { imageListContinueBtn, imageListSendEmailBtn, imageListContinueBtn } }, // English image lists
+                { "ko", new List<ImageList> { imageListContinueBtn_ko, imageListSendEmailBtn_ko, imageListContinueBtn_ko } }, // Korean image lists
+                // Add other languages and their respective image lists here
+            };
 
             // Load the appropriate resource file based on the selected language
             LocalizationHelper.LoadLocalizedStrings(Lang, buttons, imageLists, languageImageLists);
@@ -88,18 +89,26 @@ namespace RHLauncher
         private async Task<string> SendEmailRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(SendCodeUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(SendCodeUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
 
-        }));
-
+        ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
         private void HandleSendEmailResponse(string response)
         {
-            switch (response)
+            HttpResponse? httpResponse = JsonConvert.DeserializeObject<HttpResponse>(response);
+
+            if (httpResponse == null)
+            {
+                MsgBoxForm.Show(LocalizedStrings.Error + $": {LocalizedStrings.HttpResponseNull}", LocalizedStrings.Error);
+                return;
+            }
+
+            switch (httpResponse.Result)
             {
                 case "EmailSent":
                     SendEmailButton.Enabled = false;
@@ -107,6 +116,7 @@ namespace RHLauncher
                     break;
                 case "AccountExists":
                     MsgBoxForm.Show(LocalizedStrings.AccountEmailExists, LocalizedStrings.Info);
+                    ResetSendEmailButton();
                     break;
                 case "ValidVerificationCode":
                     // Hide the first panel and show the second panel
@@ -141,51 +151,65 @@ namespace RHLauncher
             // If the timer has finished counting down, stop the timer and enable the ResendEmailButton
             if (secondsLeft == 0)
             {
-                resendTimer.Stop();
-                SendEmailButton.Enabled = true;
-                TimerLabel.Text = "";
+                ResetSendEmailButton();
             }
         }
 
+        private void ResetSendEmailButton()
+        {
+            resendTimer.Stop();
+            SendEmailButton.Enabled = true;
+            TimerLabel.Text = "";
+        }
+
         private async Task<string> VerifyCodeSendRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(VerifyCodeUrl, new FormUrlEncodedContent(new[]
-            {
+            using HttpResponseMessage response = await client.PostAsync(VerifyCodeUrl, new FormUrlEncodedContent(
+            [
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
-            new KeyValuePair<string, string>("verification_code", CodeTextBox.Text),
-            new KeyValuePair<string, string>("verification_code_type", "Account"),
-
-        }));
+            new KeyValuePair<string, string>("verificationCode", CodeTextBox.Text),
+            new KeyValuePair<string, string>("verificationCodeType", "Account"),
 
+        ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
         private async Task<string> SendRequestAsync()
         {
             using HttpClient client = new();
-            using HttpResponseMessage response = await client.PostAsync(RegisterUrl, new FormUrlEncodedContent(new[]
-            {
-            new KeyValuePair<string, string>("windyCode", UsernameTextBox.Text),
+            using HttpResponseMessage response = await client.PostAsync(RegisterUrl, new FormUrlEncodedContent(
+            [
+            new KeyValuePair<string, string>("username", UsernameTextBox.Text),
             new KeyValuePair<string, string>("email", EmailTextBox.Text),
-            new KeyValuePair<string, string>("password", PasswordTextBox.Text)
-        }));
-
+            new KeyValuePair<string, string>("password", PasswordTextBox.Text),
+            new KeyValuePair<string, string>("verificationCode", CodeTextBox.Text)
+        ]));
+            response.EnsureSuccessStatusCode();
             return await response.Content.ReadAsStringAsync();
         }
 
         private void HandleResponse(string response)
         {
-            switch (response)
+            HttpResponse? accounResponse = JsonConvert.DeserializeObject<HttpResponse>(response);
+
+            if (accounResponse == null)
             {
-                case "Success":
+                MsgBoxForm.Show(LocalizedStrings.Error + $": {LocalizedStrings.HttpResponseNull}", LocalizedStrings.Error);
+                return;
+            }
+
+            switch (accounResponse.Result)
+            {
+                case "AccountCreated":
                     MsgBoxForm.Show(LocalizedStrings.AccountCreateSuccess, LocalizedStrings.RegisterWindow);
                     Close();
                     break;
-                case "AccountExists":
-                    MsgBoxForm.Show(LocalizedStrings.AccountExists, LocalizedStrings.Info);
+                case "EmailExists":
+                    MsgBoxForm.Show(LocalizedStrings.AccountEmailExists, LocalizedStrings.Info);
                     break;
-                case "WindyCodeExists":
+                case "UsernameExists":
                     MsgBoxForm.Show(LocalizedStrings.WindyCodeExists, LocalizedStrings.Error);
                     break;
                 case "InvalidUserNameFormat":
@@ -195,7 +219,7 @@ namespace RHLauncher
                     MsgBoxForm.Show(LocalizedStrings.InvalidEmailFormat, LocalizedStrings.Error);
                     break;
                 default:
-                    MsgBoxForm.Show($"{LocalizedStrings.Error}: {response}", LocalizedStrings.Error);
+                    MsgBoxForm.Show($"{LocalizedStrings.Error}: " + accounResponse.Message, LocalizedStrings.Error);
                     break;
             }
 
@@ -375,7 +399,7 @@ namespace RHLauncher
             string password = PasswordTextBox.Text;
 
             // Check for minimum length and maximum length
-            if (password.Length < 6 || password.Length > 16)
+            if (password.Length < 8 || password.Length > 16)
             {
                 PwdDescLabel.Text = LocalizedStrings.PwdDescLabelSize;
                 PwdDescLabel.ForeColor = Color.Red;
diff --git a/RHLauncher.Helper/Configuration.cs b/RHLauncher.Helper/Configuration.cs
index 9950b4a..7e12775 100644
--- a/RHLauncher.Helper/Configuration.cs
+++ b/RHLauncher.Helper/Configuration.cs
@@ -10,20 +10,20 @@ public class Configuration
 
     public Configuration()
     {
-        string apiUrl = iniFile.ReadValue("Info", "LoginURL");
+        string apiUrl = iniFile.ReadValue("Info", "ServerURL");
 
         //Client endpoints
-        GateXMLUrl = $"{apiUrl}/serverApi/gateway";
-        GateInfoUrl = $"{apiUrl}/serverApi/gateway/info";
-        GateStatusUrl = $"{apiUrl}/serverApi/gateway/status";
+        GateXMLUrl = $"{apiUrl}/launcher/GetGatewayAction";
+        GateInfoUrl = $"{apiUrl}/launcher/GetGatewayAction/info";
+        GateStatusUrl = $"{apiUrl}/launcher/GetGatewayAction/status";
 
         //Launcher endpoints
-        LoginUrl = $"{apiUrl}/accountApi/login";
-        RegisterUrl = $"{apiUrl}/accountApi/register";
-        SendCodeUrl = $"{apiUrl}/accountApi/sendVerificationEmail";
-        VerifyCodeUrl = $"{apiUrl}/accountApi/codeVerification";
-        SendPasswordCodeUrl = $"{apiUrl}/accountApi/sendPasswordResetEmail";
-        ChangePasswordUrl = $"{apiUrl}/accountApi/changePassword";
+        LoginUrl = $"{apiUrl}/launcher/LoginAction";
+        RegisterUrl = $"{apiUrl}/launcher/SignupAction";
+        SendCodeUrl = $"{apiUrl}/launcher/SendVerificationEmailAction";
+        VerifyCodeUrl = $"{apiUrl}/launcher/VerifyCodeAction";
+        SendPasswordCodeUrl = $"{apiUrl}/launcher/SendPasswordResetEmailAction";
+        ChangePasswordUrl = $"{apiUrl}/launcher/ResetPasswordAction";
         LauncherNewsUrl = $"{apiUrl}/launcher/news";
         AgreementUrl = $"{apiUrl}/launcher/agreement";
 
@@ -36,12 +36,12 @@ public class Configuration
         DownloadUpdateFileUrl = $"{apiUrl}/launcher/patch";
 
         //Launcher update endpoints
-        GetLauncherVersion = $"{apiUrl}/launcherApi/launcherUpdater/getLauncherVersion";
-        UpdateLauncherVersion = $"{apiUrl}/launcherApi/launcherUpdater/updateLauncherVersion";
+        GetLauncherVersion = $"{apiUrl}/launcherAction/getLauncherVersion";
+        UpdateLauncherVersion = $"{apiUrl}/launcherAction/updateLauncherVersion";
 
         //Launcher settings
-        string lang = iniFile.ReadValue("Launcher", "Lang");
-        Lang = lang;
+        Lang = iniFile.ReadValue("Launcher", "Lang");
+        Service = iniFile.ReadValue("Info", "Service");
     }
 
     public string GateXMLUrl { get; set; }
@@ -62,5 +62,6 @@ public class Configuration
     public string ClientPartsListUrl { get; set; }
     public string DownloadClientPartUrl { get; set; }
     public string Lang { get; set; }
+    public string Service { get; set; }
 }
 
diff --git a/RHLauncher.Helper/HttpResponse.cs b/RHLauncher.Helper/HttpResponse.cs
new file mode 100644
index 0000000..52a9d70
--- /dev/null
+++ b/RHLauncher.Helper/HttpResponse.cs
@@ -0,0 +1,36 @@
+using Newtonsoft.Json;
+
+namespace RHLauncher.RHLauncher.Helper;
+
+public class HttpResponse
+{
+    [JsonProperty("success")]
+    public string? Success { get; set; }
+
+    [JsonProperty("result")]
+    public string? Result { get; set; }
+
+    [JsonProperty("message")]
+    public string? Message { get; set; }
+}
+
+public class LoginResponse
+{
+    [JsonProperty("result")]
+    public string? Result { get; set; }
+
+    [JsonProperty("token")]
+    public string? Token { get; set; }
+
+    [JsonProperty("windyCode")]
+    public string? WindyCode { get; set; }
+
+    [JsonProperty("message")]
+    public string? Message { get; set; }
+}
+
+public class ServerStatusResponse
+{
+    [JsonProperty("status")]
+    public string? Status { get; set; }
+}
\ No newline at end of file
diff --git a/RHLauncher.Helper/IniFile.cs b/RHLauncher.Helper/IniFile.cs
index 430db1c..f3eecd5 100644
--- a/RHLauncher.Helper/IniFile.cs
+++ b/RHLauncher.Helper/IniFile.cs
@@ -21,9 +21,9 @@ namespace RHLauncher.RHLauncher.Helper
             if (!File.Exists(_iniFilePath))
             {
                 //Default api url
-                WritePrivateProfileString("Info", "LoginURL", "http://localhost:3000", _iniFilePath);
+                WritePrivateProfileString("Info", "ServerURL", "http://127.0.0.1", _iniFilePath);
                 //Default client service
-                WritePrivateProfileString("Info", "Service", "usa", _iniFilePath);
+                WritePrivateProfileString("Info", "Service", "jpn", _iniFilePath);
                 //Default launcher language
                 WritePrivateProfileString("Launcher", "Lang", "en", _iniFilePath);
             }
diff --git a/RHLauncher.csproj b/RHLauncher.csproj
index e332971..b60c6f4 100644
--- a/RHLauncher.csproj
+++ b/RHLauncher.csproj
@@ -19,8 +19,8 @@
     <AssemblyName>Launcher</AssemblyName>
     <Description>Rusty Hearts Launcher</Description>
     <PlatformTarget>x64</PlatformTarget>
-    <AssemblyVersion>1.3.0</AssemblyVersion>
-    <FileVersion>1.3.0</FileVersion>
+    <AssemblyVersion>1.4.0</AssemblyVersion>
+    <FileVersion>1.4.0</FileVersion>
   </PropertyGroup>
 
   <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
diff --git a/RHLauncher.i8n/LocalizedStrings.Designer.cs b/RHLauncher.i8n/LocalizedStrings.Designer.cs
index 6cfd2a6..d6ecb6d 100644
--- a/RHLauncher.i8n/LocalizedStrings.Designer.cs
+++ b/RHLauncher.i8n/LocalizedStrings.Designer.cs
@@ -438,6 +438,24 @@ namespace RHLauncher.RHLauncher.i8n {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Failed to process server response..
+        /// </summary>
+        public static string HttpResponseNull {
+            get {
+                return ResourceManager.GetString("HttpResponseNull", resourceCulture);
+            }
+        }
+        
+        /// <summary>
+        ///   Looks up a localized string similar to Failed to parse server response..
+        /// </summary>
+        public static string HttpResponseParseError {
+            get {
+                return ResourceManager.GetString("HttpResponseParseError", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Info.
         /// </summary>
@@ -736,7 +754,7 @@ namespace RHLauncher.RHLauncher.i8n {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to 6-16 characters.
+        ///   Looks up a localized string similar to 8-16 characters.
         /// </summary>
         public static string NewPasswordDesc {
             get {
@@ -826,7 +844,7 @@ namespace RHLauncher.RHLauncher.i8n {
         }
         
         /// <summary>
-        ///   Looks up a localized string similar to Password must be between 6-16 characters!.
+        ///   Looks up a localized string similar to Password must be between 8-16 characters!.
         /// </summary>
         public static string PwdDescLabelSize {
             get {
@@ -978,6 +996,15 @@ namespace RHLauncher.RHLauncher.i8n {
             }
         }
         
+        /// <summary>
+        ///   Looks up a localized string similar to Service.
+        /// </summary>
+        public static string Service {
+            get {
+                return ResourceManager.GetString("Service", resourceCulture);
+            }
+        }
+        
         /// <summary>
         ///   Looks up a localized string similar to Could not find Service.dat. Please check if the Install Directory is correct..
         /// </summary>
diff --git a/RHLauncher.i8n/LocalizedStrings.ko.resx b/RHLauncher.i8n/LocalizedStrings.ko.resx
index 3e5ad99..3767df3 100644
--- a/RHLauncher.i8n/LocalizedStrings.ko.resx
+++ b/RHLauncher.i8n/LocalizedStrings.ko.resx
@@ -243,6 +243,12 @@
   <data name="GameSettings" xml:space="preserve">
     <value>게임 설정</value>
   </data>
+  <data name="HttpResponseNull" xml:space="preserve">
+    <value>서버 응답을 처리하지 못했습니다.</value>
+  </data>
+  <data name="HttpResponseParseError" xml:space="preserve">
+    <value>서버 응답을 구문 분석하는 데 실패했습니다.</value>
+  </data>
   <data name="Info" xml:space="preserve">
     <value>정보</value>
   </data>
@@ -343,7 +349,7 @@
     <value>새 비밀번호를 입력하세요</value>
   </data>
   <data name="NewPasswordDesc" xml:space="preserve">
-    <value>6~16자</value>
+    <value>8~16자</value>
   </data>
   <data name="No" xml:space="preserve">
     <value>아니요</value>
@@ -373,7 +379,7 @@
     <value>비밀번호는 비워둘 수 없습니다!</value>
   </data>
   <data name="PwdDescLabelSize" xml:space="preserve">
-    <value>비밀번호는 6~16자 사이여야 합니다!</value>
+    <value>비밀번호는 8~16자 사이여야 합니다!</value>
   </data>
   <data name="PwdStrengthLabelMedium" xml:space="preserve">
     <value>매질</value>
@@ -423,6 +429,9 @@
   <data name="ServerOffline" xml:space="preserve">
     <value>게임 서버에 연결할 수 없습니다.</value>
   </data>
+  <data name="Service" xml:space="preserve">
+    <value>서비스</value>
+  </data>
   <data name="ServiceDatFileMissing" xml:space="preserve">
     <value>Service.dat를 찾을 수 없습니다. 설치 디렉터리가 올바른지 확인하세요.</value>
   </data>
diff --git a/RHLauncher.i8n/LocalizedStrings.resx b/RHLauncher.i8n/LocalizedStrings.resx
index e119731..fd6a39a 100644
--- a/RHLauncher.i8n/LocalizedStrings.resx
+++ b/RHLauncher.i8n/LocalizedStrings.resx
@@ -243,6 +243,12 @@
   <data name="GameSettings" xml:space="preserve">
     <value>Game Settings</value>
   </data>
+  <data name="HttpResponseNull" xml:space="preserve">
+    <value>Failed to process server response.</value>
+  </data>
+  <data name="HttpResponseParseError" xml:space="preserve">
+    <value>Failed to parse server response.</value>
+  </data>
   <data name="Info" xml:space="preserve">
     <value>Info</value>
   </data>
@@ -343,7 +349,7 @@
     <value>Enter the new password</value>
   </data>
   <data name="NewPasswordDesc" xml:space="preserve">
-    <value>6-16 characters</value>
+    <value>8-16 characters</value>
   </data>
   <data name="No" xml:space="preserve">
     <value>No</value>
@@ -373,7 +379,7 @@
     <value>Password cannot be empty!</value>
   </data>
   <data name="PwdDescLabelSize" xml:space="preserve">
-    <value>Password must be between 6-16 characters!</value>
+    <value>Password must be between 8-16 characters!</value>
   </data>
   <data name="PwdStrengthLabelMedium" xml:space="preserve">
     <value>Medium</value>
@@ -423,6 +429,9 @@
   <data name="ServerOffline" xml:space="preserve">
     <value>Cannot connect to the game server.</value>
   </data>
+  <data name="Service" xml:space="preserve">
+    <value>Service</value>
+  </data>
   <data name="ServiceDatFileMissing" xml:space="preserve">
     <value>Could not find Service.dat. Please check if the Install Directory is correct.</value>
   </data>