diff --git a/hwe/sammo/Constraint/ConstraintHelper.php b/hwe/sammo/Constraint/ConstraintHelper.php
index e354eaf6..e90bf713 100644
--- a/hwe/sammo/Constraint/ConstraintHelper.php
+++ b/hwe/sammo/Constraint/ConstraintHelper.php
@@ -156,6 +156,10 @@ class ConstraintHelper{
         return [__FUNCTION__];
     }
 
+    static function NotOccupiedCity():array{
+        return [__FUNCTION__];
+    }
+
     static function NotOccupiedDestCity():array{
         return [__FUNCTION__];
     }
diff --git a/hwe/sammo/Constraint/NotOccupiedCity.php b/hwe/sammo/Constraint/NotOccupiedCity.php
new file mode 100644
index 00000000..a3026569
--- /dev/null
+++ b/hwe/sammo/Constraint/NotOccupiedCity.php
@@ -0,0 +1,37 @@
+<?php
+
+namespace sammo\Constraint;
+
+class NotOccupiedCity extends Constraint{
+    const REQ_VALUES = Constraint::REQ_GENERAL|Constraint::REQ_CITY;
+
+    public function checkInputValues(bool $throwExeception=true):bool{
+        if(!parent::checkInputValues($throwExeception) && !$throwExeception){
+            return false;
+        }
+
+        if(!key_exists('nation', $this->general)){
+            if(!$throwExeception){return false; }
+            throw new \InvalidArgumentException("require nation in general");
+        }
+
+        if(!key_exists('nation', $this->city)){
+            if(!$throwExeception){return false; }
+            throw new \InvalidArgumentException("require nation in city");
+        }
+
+        return true;
+    }
+
+    public function test():bool{
+        $this->checkInputValues();
+        $this->tested = true;
+
+        if($this->city['nation'] != $this->general['nation']){
+            return true;
+        }
+
+        $this->reason = "아국입니다.";
+        return false;
+    }
+}
\ No newline at end of file