diff --git a/ktvmanager/lib/checker.py b/ktvmanager/lib/checker.py
index 02b7301..4c2daab 100644
--- a/ktvmanager/lib/checker.py
+++ b/ktvmanager/lib/checker.py
@@ -138,6 +138,16 @@ def validate_account() -> Tuple[Response, int]:
                 200,
             )
 
+        # Check if account is expired
+        exp_date_str = result["data"]["user_info"]["exp_date"]
+        if exp_date_str:
+            from datetime import datetime, timezone
+            exp_date = datetime.fromtimestamp(int(exp_date_str), tz=timezone.utc)
+            current_date = datetime.now(timezone.utc)
+            
+            if current_date > exp_date:
+                return jsonify({"message": "Account is expired", "data": result}), 401
+                
         return jsonify({"message": "Account is valid", "data": result}), 200
     else:
         return jsonify({"message": "Account is invalid"}), 401