diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index cc05d01..75663b0 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -16,11 +16,10 @@ namespace Platformer.Mechanics
             QualitySettings.vSyncCount = 0;
             Time.fixedDeltaTime = 1f / 60f;
 
-            // BT5-Dev #22 — Player(13) ↔ Enemy(14) 충돌 영구 OFF
+            // BT5-Dev #34 — Layer Matrix 영역 = Player(13) ↔ Enemy(14)만 OFF. JumpThrough Layer 8 영역 폐기.
+            // OneWay = PlatformEffector2D 영역 표준 패턴 활용 (Layer Matrix 폐기)
             Physics2D.IgnoreLayerCollision(13, 14, true);
-            // BT5-Dev #27 — Player(13) ↔ JumpThrough(8) 충돌 기본 OFF (Raycast 시점만 동적 활성)
-            Physics2D.IgnoreLayerCollision(13, 8, true);
-            Debug.Log($"[BT27-LayerSep] Player(13) ↔ Enemy(14)·JumpThrough(8) collision OFF");
+            Debug.Log($"[BT34-LayerSep] Player(13) ↔ Enemy(14) collision OFF (Layer 8 영역 폐기·PlatformEffector2D 영역 활용)");
         }
 
         /// <summary>
@@ -31,9 +30,9 @@ namespace Platformer.Mechanics
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         static void SetupJumpThroughPlatforms()
         {
-            // BT5-Dev #31 — [BT30-Collide] 진단 결과: Player 충돌 GameObject = 'Level'(Tilemap, Layer 0).
-            // PD 의도 = Level Tilemap 영역 전체 Drop-Through (점프 시 통과 + 하강 시 Raycast로 착지).
-            // 모든 Collider Layer 8 변환 (Tilemap 포함). PlatformDropThrough Raycast 거리 충분히 크게 + Start 즉시 활성.
+            // BT5-Dev #34 — Unity 표준 OneWay Platform = PlatformEffector2D + useOneWay + surfaceArc 180.
+            // 모든 일반 Collider(Tilemap 포함) PlatformEffector2D 적용. Layer 영역 무관 (기본 Layer 0 유지).
+            // 동작: 위에서 떨어지면 충돌(착지) / 옆·아래·점프 상승 시 통과
             int applied = 0, excluded = 0;
             var allColliders = Object.FindObjectsByType<Collider2D>(FindObjectsSortMode.None);
             var appliedNames = new System.Collections.Generic.List<string>();
@@ -52,15 +51,23 @@ 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;
+
+                c.usedByEffector = true;
                 var effector = c.GetComponent<PlatformEffector2D>();
-                if (effector != null) Object.Destroy(effector);
-                c.usedByEffector = false;
-                c.gameObject.layer = 8;
+                if (effector == null) effector = c.gameObject.AddComponent<PlatformEffector2D>();
+                effector.useOneWay = true;
+                effector.surfaceArc = 180f;
+                effector.rotationalOffset = 0f;
+                effector.useSideFriction = false;
+                effector.useSideBounce = false;
                 applied++;
                 if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}({c.GetType().Name})");
             }
-            Debug.Log($"[BT31-JumpThrough] applied={applied} excluded={excluded} total={allColliders.Length}");
-            Debug.Log($"[BT31-JumpThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
+            Debug.Log($"[BT34-OneWay] applied={applied} excluded={excluded} total={allColliders.Length}");
+            Debug.Log($"[BT34-OneWay] appliedSamples=[{string.Join(", ", appliedNames)}]");
         }
     }
 }
diff --git a/Assets/Scripts/Mechanics/PlayerController.cs b/Assets/Scripts/Mechanics/PlayerController.cs
index c0e7dba..cae4ade 100644
--- a/Assets/Scripts/Mechanics/PlayerController.cs
+++ b/Assets/Scripts/Mechanics/PlayerController.cs
@@ -82,8 +82,9 @@ namespace Platformer.Mechanics
             // PD 지시 2026-05-07 — 동반 컴포넌트 자동 부착 (Inspector 부착 불요)
             if (GetComponent<PlayerInvulnerabilityFlash>() == null) gameObject.AddComponent<PlayerInvulnerabilityFlash>();
             if (GetComponent<Platformer.UI.ResurrectPromptUI>() == null) gameObject.AddComponent<Platformer.UI.ResurrectPromptUI>();
-            // BT5-Dev #27 — Layer 8 발판 동적 충돌 (PD 제안 Raycast 방식)
-            if (GetComponent<PlatformDropThrough>() == null) gameObject.AddComponent<PlatformDropThrough>();
+            // BT5-Dev #34 — PlatformDropThrough 폐기 (PlatformEffector2D 표준 패턴 활용)
+            var oldDrop = GetComponent<PlatformDropThrough>();
+            if (oldDrop != null) Destroy(oldDrop);
 
             // PD 지시 2026-05-07 — 사망 시 입력 차단 / 부활 시 입력 복원
             if (health != null)