diff --git a/BaronSoftware.SSO.Sample/MainWindow.xaml b/BaronSoftware.SSO.Sample/MainWindow.xaml
index 37deac1..ee5e4d8 100644
--- a/BaronSoftware.SSO.Sample/MainWindow.xaml
+++ b/BaronSoftware.SSO.Sample/MainWindow.xaml
@@ -18,14 +18,10 @@
                    FontSize="16" FontWeight="Bold" Margin="0,0,0,12"/>
 
         <StackPanel Grid.Row="1" Orientation="Horizontal" Margin="0,0,0,12">
-            <Button x:Name="LoginButton" Content="웹뷰로 로그인" Width="140" Height="34"
-                    Click="LoginButton_Click"/>
-            <Button x:Name="TokenLoginBuggon" Content="토큰 로그인" Width="150" Height="34"
-                    Margin="8,0,0,0" Click="TokenLoginBuggon_Click"/>
-            <Button x:Name="LogoutButton" Content="로그아웃" Width="100" Height="34"
-                    Margin="8,0,0,0" Click="LogoutButton_Click"/>
-            <Button x:Name="SettingsButton" Content="설정 변경" Width="90" Height="34"
-                    Margin="8,0,0,0" Click="SettingsButton_Click"/>
+            <Button x:Name="LoginButton" Content="웹뷰로 로그인" Width="140" Height="34"/>
+            <Button x:Name="TokenLoginBuggon" Content="토큰 로그인" Width="150" Height="34"/>
+            <Button x:Name="LogoutButton" Content="로그아웃" Width="100" Height="34"/>
+            <Button x:Name="SettingsButton" Content="설정 변경" Width="90" Height="34"/>
         </StackPanel>
 
         <Border Grid.Row="2" BorderBrush="#DDDDDD" BorderThickness="1" CornerRadius="4">
diff --git a/BaronSoftware.SSO.Sample/MainWindow.xaml.cs b/BaronSoftware.SSO.Sample/MainWindow.xaml.cs
index 49a7533..d395002 100644
--- a/BaronSoftware.SSO.Sample/MainWindow.xaml.cs
+++ b/BaronSoftware.SSO.Sample/MainWindow.xaml.cs
@@ -1,11 +1,7 @@
-using BaronSoftware;
-using BaronSoftware.Auth;
 using BaronSoftware.Auth.Sample;
-using System;
 using System.Text;
 using System.Text.Json;
 using System.Text.Json.Nodes;
-using System.Threading.Tasks;
 using System.Windows;
 
 namespace BaronSoftware.SSO.Sample
@@ -23,11 +19,22 @@ namespace BaronSoftware.SSO.Sample
             InitializeComponent();
 
             _settings = SampleSettings.Load();
-            ApplySettings();
-        }
 
-        /// <summary>현재 설정으로 SSO 클라이언트를 (재)생성한다.</summary>
-        private void ApplySettings() => _license = new BaronSSO(_settings.ToOidcOptions());
+            var option = new BaronSSOOption()
+            {
+                Authority = _settings.Oidc.Authority,
+                ClientId = _settings.Oidc.ClientId,
+                RedirectUri = _settings.Oidc.RedirectUri,
+                ExtraUserValidator = new SimpleUserValidator()
+            };
+
+            _license = new BaronSSO(option);
+            LoginButton.Click += async (s,e) => await RunLogin("웹뷰 로그인", () => _license.SignInAsync());
+            TokenLoginBuggon.Click += async (s,e) => await RunLogin("토큰 로그인", () => _license.SignInAsync(_license.CurrentUser.RefreshToken));
+            SettingsButton.Click += SettingsButton_Click;
+            LogoutButton.Click += LogoutButton_Click;
+
+        }
 
         private void SettingsButton_Click(object sender, RoutedEventArgs e)
         {
@@ -41,10 +48,21 @@ namespace BaronSoftware.SSO.Sample
             _settings.Oidc.ClientId = dlg.ClientId;
             _settings.Oidc.RedirectUri = dlg.RedirectUri;
             _settings.Oidc.LogoutUri = dlg.LogoutUri;
+
             try
             {
                 _settings.Save();
-                ApplySettings();
+
+                var option = new BaronSSOOption()
+                {
+                    Authority = _settings.Oidc.Authority,
+                    ClientId = _settings.Oidc.ClientId,
+                    RedirectUri = _settings.Oidc.RedirectUri,
+                    ExtraUserValidator = new SimpleUserValidator()
+                };
+
+                _license = new BaronSSO(option);
+
                 OutputBox.Text =
                     "설정 저장 완료 ✔ (appsettings.json)\n\n" +
                     $"Authority   : {_settings.Oidc.Authority}\n" +
@@ -59,8 +77,6 @@ namespace BaronSoftware.SSO.Sample
             }
         }
 
-        private async void LoginButton_Click(object sender, RoutedEventArgs e)
-            => await RunAsync("웹뷰 로그인", () => _license.SignInAsync());
 
         private async void LogoutButton_Click(object sender, RoutedEventArgs e)
         {
@@ -80,7 +96,7 @@ namespace BaronSoftware.SSO.Sample
             }
         }
 
-        private async Task RunAsync(string action, Func<Task> work)
+        private async Task RunLogin(string action, Func<Task> work)
         {
             SetBusy(true);
             OutputBox.Text = $"{action} 진행 중...";
@@ -88,7 +104,7 @@ namespace BaronSoftware.SSO.Sample
             {
                 await work();
                 OutputBox.Text = $"{action} 완료 ✔\n\n";
-                OutputBox.Text += Format(_license.CurrentUser);
+                OutputBox.Text += ShowLoginUserInfo(_license.CurrentUser);
                 OutputBox.CaretIndex = 0; // 맨 위(요약)부터 보이도록
             }
             catch (OperationCanceledException)
@@ -105,10 +121,10 @@ namespace BaronSoftware.SSO.Sample
             }
         }
 
-        private void SetBusy(bool busy)
-            => LoginButton.IsEnabled = LogoutButton.IsEnabled = !busy;
+        private void SetBusy(bool busy)=> LoginButton.IsEnabled = LogoutButton.IsEnabled = !busy;
 
-        private string Format(UserInfo u)
+        // For Display=============
+        private string ShowLoginUserInfo(UserInfo u)
         {
             var sb = new StringBuilder();
             sb.AppendLine("로그인 성공 ✔");
@@ -150,6 +166,9 @@ namespace BaronSoftware.SSO.Sample
             catch { return json; }
         }
 
-        private async void TokenLoginBuggon_Click(object sender, RoutedEventArgs e) => await RunAsync("토큰 로그인", () => _license.SignInAsync(_license.CurrentUser.RefreshToken));
+        // ================
+
+
+
     }
 }
diff --git a/BaronSoftware.SSO.Sample/SampleSettings.cs b/BaronSoftware.SSO.Sample/SampleSettings.cs
index 4a44d96..2f85d00 100644
--- a/BaronSoftware.SSO.Sample/SampleSettings.cs
+++ b/BaronSoftware.SSO.Sample/SampleSettings.cs
@@ -73,7 +73,7 @@ namespace BaronSoftware.Auth.Sample
             Authority   = Oidc.Authority,
             ClientId    = Oidc.ClientId,
             RedirectUri = Oidc.RedirectUri,
-            Validator = new SimpleUserValidator()
+            ExtraUserValidator = new SimpleUserValidator()
         };
     }
 }
diff --git a/BaronSoftware.SSO.Sample/SimpleUserValidator.cs b/BaronSoftware.SSO.Sample/SimpleUserValidator.cs
index 4cd3153..3635fca 100644
--- a/BaronSoftware.SSO.Sample/SimpleUserValidator.cs
+++ b/BaronSoftware.SSO.Sample/SimpleUserValidator.cs
@@ -3,15 +3,15 @@ using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
+using BaronSoftware.SSO;
 
 namespace BaronSoftware.SSO.Sample
 {
     internal class SimpleUserValidator : IUserValidator
     {
-        public bool Validate(UserInfo user)
+        public void Validate(UserInfo user)
         {
-            // 가족사 아니면 거절
-            return false;
+            throw new InvalidUserException("user is not family member");
         }
     }
 }
diff --git a/BaronSoftware.SSO/BaronSSO.cs b/BaronSoftware.SSO/BaronSSO.cs
index f0805be..dc24e49 100644
--- a/BaronSoftware.SSO/BaronSSO.cs
+++ b/BaronSoftware.SSO/BaronSSO.cs
@@ -1,5 +1,3 @@
-using BaronSoftware.SSO.Exceptions;
-
 namespace BaronSoftware.SSO
 {
     /// <summary>
@@ -36,37 +34,45 @@ namespace BaronSoftware.SSO
         }
 
         /// <summary>웹뷰 로그인 창을 띄워 인증합니다.</summary>
-        public async Task SignInAsync() => await SignInAsync(null);
+        public async Task SignInAsync()
+        {
+            UserInfo? user = null;
+            if (option.EnableAutoLogin)
+                user = UserInfo.FromSsoFile();
+
+            await SignInAsync(user?.RefreshToken);
+        }
 
-        /// <summary>웹뷰 로그인 창을 띄워 인증합니다.</summary>
         public async Task SignInAsync(string refreshToken)
         {
             UserInfo user = null;
-            if(option.EnableAutoLogin)
-                user = UserInfo.FromSsoFile();
-
             var isConnected = await CheckConnection();
-            if(!isConnected && option.EnableOffline)
+            if (isConnected)
             {
+                var token = await client.LoginAsync(refreshToken);
+                var userJson = await client.GetUserInfoAsync(token.AccessToken);
+                if (string.IsNullOrEmpty(userJson))
+                    throw new InvalidOperationException($"Failed to get userinfo : {token.ToString()}");
+
+                user = UserInfo.FromJson(userJson, token);
                 if (user == null)
-                    throw new InvalidUserException("Not found authorized last user.");
-                option?.Validator?.Validate(user);
-                return;
+                    throw new InvalidUserException($"Broken user token. Token {token.ToString()}, UserJson {userJson}");
+            }
+            else
+            {
+                if (!option.EnableOffline)
+                    throw new InvalidOperationException("Network isn't available.");
+
+                user = UserInfo.FromSsoFile();
+                if (user == null)
+                    throw new InvalidUserException("Not found sso data for offline.");
             }
 
-            var token = await client.LoginAsync(refreshToken);
-            var userJson = await client.GetUserInfoAsync(token.AccessToken);
-            if (string.IsNullOrEmpty(userJson))
-                throw new InvalidOperationException($"Failed to get userinfo : {token.ToString()}");
-
-            user = UserInfo.FromJson(userJson, token);
-
-            if (user == null || option?.Validator == null)
-                throw new NullReferenceException("user or validator option is null");
-
             // 가족사가 아니고, 인증도 실패 시
-            if(!user.IsFamily()&& !option.Validator.Validate(user))
-                throw new InvalidUserException("Failed to authorize user");
+            if (user.IsFamily())
+                option?.FamilyValidator?.Validate(user);
+            else
+                option?.ExtraUserValidator?.Validate(user);
 
             CurrentUser = user;
             CurrentUser.Save();
diff --git a/BaronSoftware.SSO/BaronSSOOption.cs b/BaronSoftware.SSO/BaronSSOOption.cs
index dc755ff..1ab4bb8 100644
--- a/BaronSoftware.SSO/BaronSSOOption.cs
+++ b/BaronSoftware.SSO/BaronSSOOption.cs
@@ -38,9 +38,16 @@ namespace BaronSoftware.SSO
         /// </summary>
         public bool EnableAutoLogin { get; set; } = true;
 
+        private IUserValidator familyValidator;
+        public IUserValidator FamilyValidator 
+        { 
+            get => familyValidator ?? new DefaultFamilyUserValidator();
+            set => familyValidator = value;
+        }
+
         /// <summary>
         /// 사용자 인증에 대한 추가 검증이 필요한 경우, IUserValidator 인터페이스를 구현하여 Validator 속성에 할당할 수 있습니다.
         /// </summary>
-        public required IUserValidator? Validator { get; set; }
+        public required IUserValidator? ExtraUserValidator { get; set; }
     }
 }
diff --git a/BaronSoftware.SSO/Exceptions/InvalidUserException.cs b/BaronSoftware.SSO/Exceptions/InvalidUserException.cs
index 53ed86c..212bd91 100644
--- a/BaronSoftware.SSO/Exceptions/InvalidUserException.cs
+++ b/BaronSoftware.SSO/Exceptions/InvalidUserException.cs
@@ -4,10 +4,13 @@ using System.Linq;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace BaronSoftware.SSO.Exceptions
+namespace BaronSoftware.SSO
 {
-    internal class InvalidUserException : Exception
-    {   
+    public class InvalidUserException : Exception
+    {
+        public UserInfo userinfo { get; }
+
+        public InvalidUserException(UserInfo userinfo) { }
         public InvalidUserException() { }
         public InvalidUserException(string message) : base(message) { }
         public InvalidUserException(string message, Exception inner) : base(message, inner) { }
diff --git a/BaronSoftware.SSO/Features/Validator/DefaultFamilyUserValidator.cs b/BaronSoftware.SSO/Features/Validator/DefaultFamilyUserValidator.cs
new file mode 100644
index 0000000..c8b96f9
--- /dev/null
+++ b/BaronSoftware.SSO/Features/Validator/DefaultFamilyUserValidator.cs
@@ -0,0 +1,13 @@
+namespace BaronSoftware.SSO
+{
+    internal class DefaultFamilyUserValidator : IUserValidator
+    {
+        public void Validate(UserInfo user) 
+        {
+            if (user.IsCenter() || user.IsFamily())
+                return;
+
+            throw new InvalidUserException(user);
+        }
+    }
+}
diff --git a/BaronSoftware.SSO/Features/Validator/IUserValidator.cs b/BaronSoftware.SSO/Features/Validator/IUserValidator.cs
index a68c0a8..ecb0244 100644
--- a/BaronSoftware.SSO/Features/Validator/IUserValidator.cs
+++ b/BaronSoftware.SSO/Features/Validator/IUserValidator.cs
@@ -5,9 +5,10 @@ namespace BaronSoftware.SSO
     public interface IUserValidator
     {
         /// <summary>
-        /// 인증 실패 시 예외를 던지세요
+        /// 사용자 인증 처리기. 
+        /// 인증 실패 시, 반드시 예외를 던져서 처리하세요
         /// </summary>
         /// <param name="user"></param>
-        public bool Validate(UserInfo user);
+        public void Validate(UserInfo user);
     }
 }