diff --git a/Assets/Scripts/Gameplay/PlayerEnemyCollision.cs b/Assets/Scripts/Gameplay/PlayerEnemyCollision.cs
index 1983881..3457d2b 100644
--- a/Assets/Scripts/Gameplay/PlayerEnemyCollision.cs
+++ b/Assets/Scripts/Gameplay/PlayerEnemyCollision.cs
@@ -48,7 +48,14 @@ namespace Platformer.Gameplay
                 return;
             }
 
-            // 측면·아래 충돌 — i-frame 적용 피격
+            // BT5-Dev #35 — 점프 상태(공중) 측면 충돌 시 피해 X 방어 코드 (PD 지시)
+            if (!player.IsGrounded)
+            {
+                Debug.Log($"[PEC] 점프 상태 측면 충돌 영역 피해 차단 (delta={dyAtCollision:F2})");
+                return;
+            }
+
+            // 지상 상태 측면·아래 충돌 — i-frame 적용 피격
             if (player.health.IsInvulnerable) return;
             player.health.Decrement();
         }
diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index 75663b0..3d50858 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -51,10 +51,32 @@ namespace Platformer.Mechanics
                     continue;
                 }
 
-                // BT34 — Layer 8 변환 폐기 (Layer 0 유지) + PlatformEffector2D 영역 OneWay 적용
-                // BT31 영역 잔존 Layer 8 영역 → Layer 0 복원
                 if (c.gameObject.layer == 8) c.gameObject.layer = 0;
 
+                // BT5-Dev #35 — TilemapCollider2D 영역 표준 패턴 (CompositeCollider2D + Rigidbody2D Static + PlatformEffector2D)
+                var tilemapCollider = c.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
+                if (tilemapCollider != null)
+                {
+                    tilemapCollider.compositeOperation = Collider2D.CompositeOperation.Merge;
+                    var composite = c.GetComponent<CompositeCollider2D>();
+                    if (composite == null) composite = c.gameObject.AddComponent<CompositeCollider2D>();
+                    var rb = c.GetComponent<Rigidbody2D>();
+                    if (rb == null) rb = c.gameObject.AddComponent<Rigidbody2D>();
+                    rb.bodyType = RigidbodyType2D.Static;
+                    composite.usedByEffector = true;
+                    var compositeEffector = c.GetComponent<PlatformEffector2D>();
+                    if (compositeEffector == null) compositeEffector = c.gameObject.AddComponent<PlatformEffector2D>();
+                    compositeEffector.useOneWay = true;
+                    compositeEffector.surfaceArc = 180f;
+                    compositeEffector.rotationalOffset = 0f;
+                    compositeEffector.useSideFriction = false;
+                    compositeEffector.useSideBounce = false;
+                    applied++;
+                    if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}(Tilemap+Composite)");
+                    continue;
+                }
+
+                // 일반 Collider — PlatformEffector2D 직접 적용
                 c.usedByEffector = true;
                 var effector = c.GetComponent<PlatformEffector2D>();
                 if (effector == null) effector = c.gameObject.AddComponent<PlatformEffector2D>();
@@ -66,8 +88,8 @@ namespace Platformer.Mechanics
                 applied++;
                 if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}({c.GetType().Name})");
             }
-            Debug.Log($"[BT34-OneWay] applied={applied} excluded={excluded} total={allColliders.Length}");
-            Debug.Log($"[BT34-OneWay] appliedSamples=[{string.Join(", ", appliedNames)}]");
+            Debug.Log($"[BT35-OneWay] applied={applied} excluded={excluded} total={allColliders.Length}");
+            Debug.Log($"[BT35-OneWay] appliedSamples=[{string.Join(", ", appliedNames)}]");
         }
     }
 }