diff --git a/apps/article/admin.py b/apps/article/admin.py
index fbe60a7..5450b81 100755
--- a/apps/article/admin.py
+++ b/apps/article/admin.py
@@ -183,10 +183,6 @@ class ArticleCategoryAdmin(ModelAdmin):
         if form.base_fields.get('slug'):
             form.base_fields['slug'].required = False
         return form
-        
-    @display(description=_("Category"), header=True)
-    def display_header(self, obj):
-        return list(obj.title)
 
 
 class ArticleAdmin(ModelAdmin):
diff --git a/apps/course/urls.py b/apps/course/urls.py
index 6c5fa54..8028538 100644
--- a/apps/course/urls.py
+++ b/apps/course/urls.py
@@ -9,7 +9,7 @@ urlpatterns = [
     path('categories/', views.CourseCategoryAPIView.as_view(), name='course-categories'),
     path('', views.CourseListAPIView.as_view(), name='course-list'),
     path('my-courses/', views.MyCourseListAPIView.as_view(), name='course-my-courses-list'),
-    path('lesson/completion/', views.LessonCompletionCreateAPIView.as_view(), name='lesson-completion'),
+    path('lesson/completion/', views.LessonCompletionToggleAPIView.as_view(), name='lesson-completion'),
     path('professors/', views.ProfessorListAPIView.as_view(), name='course-professor-list'),
     re_path(r'professors/(?P<slug>[\w-]+)/courses/$', views.ProfessorCourseListAPIView.as_view(), name='course-professor-course-list'),
     re_path(r'professors/(?P<slug>[\w-]+)/$', views.ProfessorDetailAPIView.as_view(), name='course-professor-detail'),
diff --git a/apps/course/views/lesson.py b/apps/course/views/lesson.py
index 111cbe5..81b6396 100644
--- a/apps/course/views/lesson.py
+++ b/apps/course/views/lesson.py
@@ -105,44 +105,55 @@ class LessonDetailView(RetrieveAPIView):
 
 
 
-class LessonCompletionCreateAPIView(GenericAPIView):
+class LessonCompletionToggleAPIView(GenericAPIView):
     permission_classes = [IsAuthenticated]
 
-
     @swagger_auto_schema(
-        operation_description="Mark a lesson as completed",
+        operation_description="Toggle lesson completion status (Check/Uncheck)",
         tags=["Imam-Javad - Course"],
         request_body=openapi.Schema(
             type=openapi.TYPE_OBJECT,
             required=['lesson_id'],
             properties={
-                'lesson_id': openapi.Schema(type=openapi.TYPE_INTEGER, description='ID of the lesson to be marked as completed'),
+                'lesson_id': openapi.Schema(type=openapi.TYPE_INTEGER, description='ID of the lesson to toggle'),
             },
         ),
         responses={
-            201: 'Lesson completed successfully.',
-            200: 'Lesson already completed.',
+            201: 'Lesson marked as COMPLETED.',
+            200: 'Lesson marked as INCOMPLETE (Unchecked).',
             400: 'Lesson ID is required.',
             404: 'Lesson not found.',
         }
     )
     def post(self, request):
-        student = request.user  # Assuming the user is the student
+        student = request.user
         lesson_id = request.data.get('lesson_id')
 
         if not lesson_id:
             return Response({'error': 'Lesson ID is required.'}, status=status.HTTP_400_BAD_REQUEST)
+
         try:
             course_lesson = CourseLesson.objects.get(id=lesson_id)
         except CourseLesson.DoesNotExist:
             return Response({'error': 'Lesson not found.'}, status=status.HTTP_404_NOT_FOUND)
 
-        # Check if the lesson is already completed by the student
-        if LessonCompletion.objects.filter(student=student, course_lesson=course_lesson).exists():
-            return Response({'message': 'Lesson already completed.'}, status=status.HTTP_200_OK)
-
-        # Create a new completion record
-        completion = LessonCompletion(student=student, course_lesson=course_lesson)
-        completion.save()
-
-        return Response({'message': 'Lesson completed successfully.'}, status=status.HTTP_201_CREATED)
\ No newline at end of file
+        # TOGGLE LOGIC
+        # Try to find an existing completion record
+        completion = LessonCompletion.objects.filter(student=student, course_lesson=course_lesson).first()
+
+        if completion:
+            # Scenario: The user clicked by mistake or wants to un-check
+            # Action: Delete the record
+            completion.delete()
+            return Response(
+                {'message': 'Lesson marked as incomplete.', 'is_completed': False}, 
+                status=status.HTTP_200_OK
+            )
+        else:
+            # Scenario: The lesson is not finished yet
+            # Action: Create the record
+            LessonCompletion.objects.create(student=student, course_lesson=course_lesson)
+            return Response(
+                {'message': 'Lesson completed successfully.', 'is_completed': True}, 
+                status=status.HTTP_201_CREATED
+            )
\ No newline at end of file