diff --git a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
index 243112b..12f6609 100644
--- a/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
+++ b/app/src/main/java/com/medithings/vesiscan/ui/views/monitoring/PlacementGuideView.kt
@@ -934,7 +934,17 @@ fun PlacementGuideView(appState: AppState) {
                             directionHint = context.getString(R.string.placement_check_attachment)
                             directionIcon = ""
                             placementScore = 0
-                            bleManager.debugLogger.info("ALIGN_V2 sanity: 0/6 walls · override to attachment check")
+                            // 2026-08-05: 사용자가 Start 눌렀는데 0/6 감지 시 · Start 화면 복귀.
+                            //   그렇지 않으면 "아무것도 안 됨" 처럼 느껴짐 (button 사라진 채 hint 만 반복).
+                            //   prevDetached=true 로 세팅해 Start 재클릭 시 즉시 팝업 발생 (line ~1229 가드).
+                            if (!waitingForStart) {
+                                isContinuousMode = false
+                                waitingForStart = true
+                                prevDetached = true
+                                bleManager.debugLogger.warn("ALIGN_V2 sanity: 0/6 walls · Start 후 부착 실패 · waitingForStart 복귀")
+                            } else {
+                                bleManager.debugLogger.info("ALIGN_V2 sanity: 0/6 walls · override to attachment check")
+                            }
                         } else if (st.state == "accum") {
                             directionHint = localizedMsg
                             directionIcon = ""