diff --git a/TaxBaik.Web.Client/Components/Admin/Pages/Login.razor b/TaxBaik.Web.Client/Components/Admin/Pages/Login.razor
index 1524f6c..d8fb883 100644
--- a/TaxBaik.Web.Client/Components/Admin/Pages/Login.razor
+++ b/TaxBaik.Web.Client/Components/Admin/Pages/Login.razor
@@ -1,6 +1,6 @@
 @page "/admin/login"
 @layout TaxBaik.WasmClient.Components.Admin.Layout.BlankLayout
 @attribute [AllowAnonymous]
-@rendermode @(new InteractiveWebAssemblyRenderMode(prerender: true))
+@rendermode InteractiveWebAssembly
 <PageTitle>로그인</PageTitle>
 <AdminLoginForm />
diff --git a/TaxBaik.Web/Pages/Contact.cshtml b/TaxBaik.Web/Pages/Contact.cshtml
index aa63541..950ad4f 100644
--- a/TaxBaik.Web/Pages/Contact.cshtml
+++ b/TaxBaik.Web/Pages/Contact.cshtml
@@ -15,13 +15,28 @@
 
     @if (TempData["Success"] != null)
     {
-        <div id="contact-success" class="alert alert-success alert-dismissible fade show" role="alert">
-            @TempData["Success"]
+        <div id="contact-success" class="alert alert-success alert-dismissible fade show" role="alert" role="status" style="font-size: 1.05rem;">
+            <strong>✅ 성공!</strong> @TempData["Success"]
             <button type="button" class="btn-close" data-bs-dismiss="alert"></button>
         </div>
+        <script>
+            // 성공 메시지를 3초 후 자동 숨김 (사용자 클릭 가능)
+            setTimeout(() => {
+                const alert = document.getElementById('contact-success');
+                if (alert) {
+                    const bsAlert = new bootstrap.Alert(alert);
+                    bsAlert.close();
+                }
+            }, 5000);
+            // 폼 자동 초기화
+            setTimeout(() => {
+                document.querySelector('form').reset();
+                document.getElementById('agree').checked = false;
+            }, 1000);
+        </script>
     }
 
-    <form method="post">
+    <form method="post" id="contactForm">
         @Html.AntiForgeryToken()
         <div asp-validation-summary="ModelOnly" class="text-danger mb-3"></div>
 
diff --git a/TaxBaik.Web/Program.cs b/TaxBaik.Web/Program.cs
index ad96f0e..609e866 100644
--- a/TaxBaik.Web/Program.cs
+++ b/TaxBaik.Web/Program.cs
@@ -81,6 +81,17 @@ builder.Services.Configure<Microsoft.AspNetCore.Components.Server.CircuitOptions
     options.DetailedErrors = true;
 });
 
+// Session & TempData (쿠키 저장소)
+builder.Services.AddSession(options =>
+{
+    options.IdleTimeout = TimeSpan.FromMinutes(20);
+    options.Cookie.HttpOnly = true;
+    options.Cookie.IsEssential = true;
+    options.Cookie.Name = "TaxBaik.SessionId";
+});
+builder.Services.AddDistributedMemoryCache();
+// TempData는 기본적으로 쿠키 저장소 사용 (여기서 명시적 설정)
+
 // JWT 인증
 var connectionString = builder.Configuration.GetConnectionString("Default")
     ?? throw new InvalidOperationException("Missing connection string");
@@ -369,6 +380,7 @@ catch (Exception ex)
 app.UsePathBase("/taxbaik");
 app.UseResponseCompression();
 app.UseStaticFiles();
+app.UseSession();  // TempData 쿠키 저장소
 app.UseRouting();
 app.UseRateLimiter();
 app.UseAuthentication();
diff --git a/tests/e2e/blog-validation.spec.ts b/tests/e2e/blog-validation.spec.ts
index 4d08560..b279343 100644
--- a/tests/e2e/blog-validation.spec.ts
+++ b/tests/e2e/blog-validation.spec.ts
@@ -5,6 +5,14 @@ const username = 'test_admin';
 const password = 'TestAdmin@123456';
 
 test('Blog Management Full Flow - Real Domain Validation', async ({ page }) => {
+  // 콘솔 로그 & 에러 캡처
+  page.on('console', msg => console.log('CONSOLE:', msg.type(), msg.text()));
+  page.on('pageerror', err => console.log('PAGEERROR:', err.message, err.stack));
+  page.on('response', res => {
+    if (!res.ok() && res.status() !== 304)
+      console.log('BAD HTTP:', res.status(), res.url());
+  });
+
   console.log('\n=== 1단계: 로그인 페이지 이동 ===');
   await page.goto(`${baseUrl}/admin/login`, { waitUntil: 'networkidle' });