diff --git a/Flow.Launcher.Core/Resource/Theme.cs b/Flow.Launcher.Core/Resource/Theme.cs
index e30216ef9..a2258ea57 100644
--- a/Flow.Launcher.Core/Resource/Theme.cs
+++ b/Flow.Launcher.Core/Resource/Theme.cs
@@ -236,36 +236,36 @@ namespace Flow.Launcher.Core.Resource
         }
 
 
-        public void SetCornerForWindow()
-        {
-            Application.Current.Dispatcher.Invoke(() =>
-            {
-                var dict = GetThemeResourceDictionary(_settings.Theme);
-                if (dict == null)
-                    return;
+        //public void SetCornerForWindow()
+        //{
+        //    Application.Current.Dispatcher.Invoke(() =>
+        //    {
+        //        var dict = GetThemeResourceDictionary(_settings.Theme);
+        //        if (dict == null)
+        //            return;
 
-                System.Windows.Window mainWindow = Application.Current.MainWindow;
-                if (mainWindow == null)
-                    return;
+        //        System.Windows.Window mainWindow = Application.Current.MainWindow;
+        //        if (mainWindow == null)
+        //            return;
 
-                if (dict.Contains("CornerType") && dict["CornerType"] is string cornerMode)
-                {
-                    DWM_WINDOW_CORNER_PREFERENCE preference = cornerMode switch
-                    {
-                        "DoNotRound" => DWM_WINDOW_CORNER_PREFERENCE.DoNotRound,
-                        "Round" => DWM_WINDOW_CORNER_PREFERENCE.Round,
-                        "RoundSmall" => DWM_WINDOW_CORNER_PREFERENCE.RoundSmall,
-                        _ => DWM_WINDOW_CORNER_PREFERENCE.Default,
-                    };
+        //        if (dict.Contains("CornerType") && dict["CornerType"] is string cornerMode)
+        //        {
+        //            DWM_WINDOW_CORNER_PREFERENCE preference = cornerMode switch
+        //            {
+        //                "DoNotRound" => DWM_WINDOW_CORNER_PREFERENCE.DoNotRound,
+        //                "Round" => DWM_WINDOW_CORNER_PREFERENCE.Round,
+        //                "RoundSmall" => DWM_WINDOW_CORNER_PREFERENCE.RoundSmall,
+        //                _ => DWM_WINDOW_CORNER_PREFERENCE.Default,
+        //            };
 
-                    SetWindowCornerPreference(mainWindow, preference);
-                }
-                else
-                {
-                    SetWindowCornerPreference(mainWindow, DWM_WINDOW_CORNER_PREFERENCE.Default);
-                }
-            }, DispatcherPriority.Normal);
-        }
+        //            SetWindowCornerPreference(mainWindow, preference);
+        //        }
+        //        else
+        //        {
+        //            SetWindowCornerPreference(mainWindow, DWM_WINDOW_CORNER_PREFERENCE.Default);
+        //        }
+        //    }, DispatcherPriority.Normal);
+        //}
 
 
         /// <summary>
@@ -389,7 +389,7 @@ namespace Flow.Launcher.Core.Resource
 
             Application.Current.Dispatcher.Invoke(() =>
             {
-                // 1. 기존 WindowBorderStyle을 복사
+                // ✅ 기존 WindowBorderStyle을 복사
                 var previewStyle = new Style(typeof(Border));
                 if (Application.Current.Resources.Contains("WindowBorderStyle"))
                 {
@@ -403,16 +403,23 @@ namespace Flow.Launcher.Core.Resource
                     }
                 }
 
-                // 2. 투명도 제거 후 background 적용
+                // ✅ 배경색 적용 (투명도 제거)
                 Color backgroundColor = Color.FromRgb(bgColor.Value.R, bgColor.Value.G, bgColor.Value.B);
                 previewStyle.Setters.Add(new Setter(Border.BackgroundProperty, new SolidColorBrush(backgroundColor)));
 
-                // 3. 기타 설정 추가
-                previewStyle.Setters.Add(new Setter(Border.BorderThicknessProperty, new Thickness(0)));
-                previewStyle.Setters.Add(new Setter(Border.CornerRadiusProperty, new CornerRadius(5)));
-                previewStyle.Setters.Add(new Setter(Border.UseLayoutRoundingProperty, true));
-                previewStyle.Setters.Add(new Setter(Border.SnapsToDevicePixelsProperty, true));
+                // ✅ 블러 테마면 CornerRadius = 5, 비블러 테마면 기존 스타일 유지
+                if (BlurEnabled)
+                {
+                    previewStyle.Setters.Add(new Setter(Border.CornerRadiusProperty, new CornerRadius(5)));
+                    previewStyle.Setters.Add(new Setter(Border.BorderThicknessProperty, new Thickness(1)));
+                }
 
+                // ✅ 기타 설정 추가
+                //previewStyle.Setters.Add(new Setter(Border.BorderThicknessProperty, new Thickness(1)));
+                //previewStyle.Setters.Add(new Setter(Border.UseLayoutRoundingProperty, true));
+                //reviewStyle.Setters.Add(new Setter(Border.SnapsToDevicePixelsProperty, true));
+
+                // ✅ 최종 적용
                 Application.Current.Resources["PreviewWindowBorderStyle"] = previewStyle;
             }, DispatcherPriority.Render);
         }
diff --git a/Flow.Launcher/SettingPages/ViewModels/SettingsPaneThemeViewModel.cs b/Flow.Launcher/SettingPages/ViewModels/SettingsPaneThemeViewModel.cs
index 2f1362db2..73ce7217c 100644
--- a/Flow.Launcher/SettingPages/ViewModels/SettingsPaneThemeViewModel.cs
+++ b/Flow.Launcher/SettingPages/ViewModels/SettingsPaneThemeViewModel.cs
@@ -35,20 +35,23 @@ public partial class SettingsPaneThemeViewModel : BaseModel
             _selectedTheme = value;
             ThemeManager.Instance.ChangeTheme(value.FileNameWithoutExtension);
 
-            // ✅ 테마 변경 후 BackdropType 자동 업데이트
+            // ✅ 비블러 테마로 변경 시 BackdropType을 None으로 자동 설정
             if (!ThemeManager.Instance.BlurEnabled)
             {
                 Settings.BackdropType = BackdropTypes.None;
             }
 
+            // ✅ 블러 테마에서는 DropShadow를 자동으로 켜고 비활성화 (사용자 변경 불가)
+            if (ThemeManager.Instance.BlurEnabled)
+            {
+                Settings.UseDropShadowEffect = true;
+            }
+
+            // ✅ UI 상태 업데이트
             OnPropertyChanged(nameof(BackdropType));
             OnPropertyChanged(nameof(IsBackdropEnabled));
-
-            if (ThemeManager.Instance.BlurEnabled && Settings.UseDropShadowEffect == false)
-            {
-                DropShadowEffect = true;
-                OnPropertyChanged(nameof(IsDropShadowEnabled));
-            }
+            OnPropertyChanged(nameof(IsDropShadowEnabled));
+            OnPropertyChanged(nameof(DropShadowEffect));
 
             ThemeManager.Instance.RefreshFrame();
         }
@@ -61,12 +64,14 @@ public partial class SettingsPaneThemeViewModel : BaseModel
         get => Settings.UseDropShadowEffect;
         set
         {
-            if (ThemeManager.Instance.BlurEnabled && value == false)
+            if (ThemeManager.Instance.BlurEnabled)
             {
+                // 🔥 블러 테마에서는 항상 DropShadowEffect = true 유지
                 Settings.UseDropShadowEffect = true;
                 return;
             }
 
+            // ✅ 비블러 테마에서는 사용자가 수동으로 변경 가능
             if (value)
             {
                 ThemeManager.Instance.AddDropShadowEffectToCurrentTheme();
@@ -77,6 +82,9 @@ public partial class SettingsPaneThemeViewModel : BaseModel
             }
 
             Settings.UseDropShadowEffect = value;
+
+            // ✅ UI 업데이트
+            OnPropertyChanged(nameof(DropShadowEffect));
         }
     }