diff --git a/Assets/Prefabs/Enemy.prefab b/Assets/Prefabs/Enemy.prefab
index 5bd3891..47e36fa 100644
--- a/Assets/Prefabs/Enemy.prefab
+++ b/Assets/Prefabs/Enemy.prefab
@@ -17,9 +17,9 @@ GameObject:
   - component: {fileID: 772289407653213039}
   - component: {fileID: 5843668731025413174}
   - component: {fileID: 7700000000000000002}
-  m_Layer: 13
+  m_Layer: 14
   m_Name: Enemy
-  m_TagString: Player
+  m_TagString: Untagged
   m_Icon: {fileID: 0}
   m_NavMeshLayer: 0
   m_StaticEditorFlags: 0
diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index 47e987f..e03960f 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -15,6 +15,11 @@ namespace Platformer.Mechanics
             Application.targetFrameRate = 60;
             QualitySettings.vSyncCount = 0;
             Time.fixedDeltaTime = 1f / 60f;
+
+            // BT5-Dev #22 — Layer 영역 분리: Player(13) ↔ Enemy(14) 충돌 영구 OFF.
+            // IgnoreCollision 영역 instance 의존 X = 모든 Player·Enemy 영역 자동 통과 영역.
+            Physics2D.IgnoreLayerCollision(13, 14, true);
+            Debug.Log($"[BT22-LayerSep] Player(13) ↔ Enemy(14) collision OFF");
         }
 
         /// <summary>