diff --git a/Assets/Scripts/Mechanics/GameOptimizer.cs b/Assets/Scripts/Mechanics/GameOptimizer.cs
index 1b43337..91a4cd7 100644
--- a/Assets/Scripts/Mechanics/GameOptimizer.cs
+++ b/Assets/Scripts/Mechanics/GameOptimizer.cs
@@ -30,9 +30,8 @@ namespace Platformer.Mechanics
         [RuntimeInitializeOnLoadMethod(RuntimeInitializeLoadType.AfterSceneLoad)]
         static void SetupJumpThroughPlatforms()
         {
-            // BT5-Dev #38 — 표준 Drop-Through 패턴: Layer 16(JumpThrough) + 동적 IgnoreLayerCollision 토글
-            // 점프 상승 = IgnoreLayerCollision(13, 16, true) 통과 / 하강 = false 충돌 ON
-            int applied = 0, excluded = 0;
+            // BT5-Dev #44 — 일반 지면(Level Tilemap) Layer 0 일반 충돌 + 공중 발판(Foreground·별개 BoxCollider2D)만 Layer 16
+            int applied = 0, excluded = 0, levelKept = 0;
             var allColliders = Object.FindObjectsByType<Collider2D>(FindObjectsSortMode.None);
             var appliedNames = new System.Collections.Generic.List<string>();
             foreach (var c in allColliders)
@@ -50,19 +49,35 @@ namespace Platformer.Mechanics
                     continue;
                 }
 
-                // BT38 — PlatformEffector2D·CompositeCollider2D·Rigidbody2D 영역 영역 영역 폐기
+                // BT44 — Level Tilemap (TilemapCollider2D) = 일반 지면 Layer 0 그대로 (Drop-Through 영역 외)
+                if (c.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>() != null && c.gameObject.name == "Level")
+                {
+                    if (c.gameObject.layer == 16) c.gameObject.layer = 0;  // BT38·BT40·BT43 잔존 복원
+                    levelKept++;
+                    continue;
+                }
+
                 var effector = c.GetComponent<PlatformEffector2D>();
                 if (effector != null) Object.Destroy(effector);
                 c.usedByEffector = false;
 
-                // Layer 16(JumpThrough) 변환
                 c.gameObject.layer = 16;
                 applied++;
                 if (appliedNames.Count < 8) appliedNames.Add($"{c.gameObject.name}({c.GetType().Name})");
             }
-            Debug.Log($"[BT40-DropThrough] applied={applied} excluded={excluded} total={allColliders.Length}");
-            Debug.Log($"[BT40-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
-            // BT40 — Layer Matrix는 항시 ON. PlayerController.UpdateContactFilterForDropThrough에서 raycast contactFilter mask 동적 갱신
+
+            // BT44 — Foreground GameObject(시각만·Collider 미부착) → TilemapCollider2D 동적 추가 + Layer 16 (공중 발판)
+            var foreground = GameObject.Find("Foreground");
+            if (foreground != null)
+            {
+                var fgTc = foreground.GetComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
+                if (fgTc == null) fgTc = foreground.AddComponent<UnityEngine.Tilemaps.TilemapCollider2D>();
+                foreground.layer = 16;
+                Debug.Log($"[BT44-Foreground] TilemapCollider2D + Layer 16 applied to 'Foreground'");
+            }
+
+            Debug.Log($"[BT44-DropThrough] Layer16 applied={applied} levelKeptLayer0={levelKept} excluded={excluded} total={allColliders.Length}");
+            Debug.Log($"[BT44-DropThrough] appliedSamples=[{string.Join(", ", appliedNames)}]");
         }
     }
 }