diff --git a/Assets/02_Scripts/MonsterController.cs b/Assets/02_Scripts/MonsterController.cs
index c56a802..026a12f 100644
--- a/Assets/02_Scripts/MonsterController.cs
+++ b/Assets/02_Scripts/MonsterController.cs
@@ -10,16 +10,43 @@ public class MonsterController : MonoBehaviour
     }
 
     public State monsterState;
+    public float attackDist = 2.0f;
+    public float traceDist = 10.0f;
+
+    public bool isDie = false;
+
+    public Transform playerTr, monsterTr;
 
     // Start is called before the first frame update
     void Start()
     {
-
+        playerTr = GameObject.Find("Player").GetComponent<Transform>();
+        monsterTr = transform;
     }
 
-    // Update is called once per frame
-    void Update()
+    IEnumerator CheckMonsterState()
     {
+        while (!isDie)
+        {
+            // 거리 계산
+            float distance = Vector3.Distance(playerTr.position, monsterTr.position);
 
+            if (distance <= attackDist)
+            {
+                monsterState = State.ATTACK;
+            }
+            else if (distance <= traceDist)
+            {
+                monsterState = State.TRACE;
+            }
+            else
+            {
+                monsterState = State.IDLE;
+            }
+
+            yield return new WaitForSeconds(0.3f);
+        }
     }
+
+
 }