diff --git a/Assets/Scripts/Mechanics/PlayerController.cs b/Assets/Scripts/Mechanics/PlayerController.cs
index 93041fa..cbfccdc 100644
--- a/Assets/Scripts/Mechanics/PlayerController.cs
+++ b/Assets/Scripts/Mechanics/PlayerController.cs
@@ -204,9 +204,12 @@ namespace Platformer.Mechanics
         {
             int baseMask = Physics2D.GetLayerCollisionMask(gameObject.layer);
 
-            // BT5-Dev #42 — PD 의도: 발판 위 착지(서있는) 영역만 충돌 ON, 걷기·점프·측면 영역 모두 통과
+            // BT5-Dev #43 — IsGrounded 영역 폐기 (frame 0 미설정 → 떨어짐). footHit 단독 + 점프 영역 OFF 강제
+            bool isJumpingThrough = jumpState == JumpState.Jumping
+                                    || (jumpState == JumpState.InFlight && velocity.y > 0.01f);
+
             bool standingOnPlatform = false;
-            if (collider2d != null && IsGrounded)
+            if (collider2d != null && !isJumpingThrough)
             {
                 Vector2 footPos = new Vector2(collider2d.bounds.center.x, collider2d.bounds.min.y + 0.02f);
                 int jumpThroughMask = 1 << JUMP_THROUGH_LAYER;