diff --git a/app/src/main/java/kr/co/vividnext/sodalive/live/room/LiveRoomActivity.kt b/app/src/main/java/kr/co/vividnext/sodalive/live/room/LiveRoomActivity.kt
index 8af53873..99760d0f 100644
--- a/app/src/main/java/kr/co/vividnext/sodalive/live/room/LiveRoomActivity.kt
+++ b/app/src/main/java/kr/co/vividnext/sodalive/live/room/LiveRoomActivity.kt
@@ -2,8 +2,8 @@ package kr.co.vividnext.sodalive.live.room
 
 import android.animation.Animator
 import android.animation.AnimatorListenerAdapter
-import android.animation.ObjectAnimator
 import android.animation.ValueAnimator
+import android.animation.ObjectAnimator
 import android.annotation.SuppressLint
 import android.app.AlertDialog
 import android.content.ClipData
@@ -1370,9 +1370,9 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
 
     private fun donation(can: Int, message: String, isSecret: Boolean) {
         val rawMessage = if (isSecret) {
-            getString(R.string.screen_live_room_secret_mission_sent, can)
+            getString(R.string.screen_live_room_secret_mission_sent, can.toString())
         } else {
-            getString(R.string.screen_live_room_donation_sent, can)
+            getString(R.string.screen_live_room_donation_sent, can.toString())
         }
 
         viewModel.donation(roomId, can, message, isSecret) { signature ->
@@ -2443,13 +2443,11 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
         val dm = resources.displayMetrics
         val fallbackW = if (rw > 0) rw else dm.widthPixels
         val fallbackH = if (rh > 0) rh else dm.heightPixels
-        val minX = margin
-        val maxX = (fallbackW.toFloat() - margin).coerceAtLeast(minX + 1f)
-        val minY = margin
-        val maxY = (fallbackH.toFloat() - margin).coerceAtLeast(minY + 1f)
+        val maxX = (fallbackW.toFloat() - margin).coerceAtLeast(margin + 1f)
+        val maxY = (fallbackH.toFloat() - margin).coerceAtLeast(margin + 1f)
 
-        fun randomX(): Float = minX + Random.nextFloat() * (maxX - minX)
-        fun randomY(): Float = minY + Random.nextFloat() * (maxY - minY)
+        fun randomX(): Float = margin + Random.nextFloat() * (maxX - margin)
+        fun randomY(): Float = margin + Random.nextFloat() * (maxY - margin)
 
         // 0: 중앙, 1..4: 랜덤 위치
         repeat(totalExplosions) { index ->
@@ -2505,17 +2503,17 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
         private val baseHeartPath: Path = Path().apply {
             // Swift HeartShape와 동일한 하트 경로 (정규화 좌표 [-1,1]에 0.9 스케일 반영)
             reset()
-            val S = 0.9f
-            moveTo(0f, -0.45f * S)
+            val s = 0.9f
+            moveTo(0f, -0.45f * s)
             cubicTo(
-                0.62f * S, -1.02f * S,
-                1.22f * S, -0.04f * S,
-                0f, 0.65f * S
+                0.62f * s, -1.02f * s,
+                1.22f * s, -0.04f * s,
+                0f, 0.65f * s
             )
             cubicTo(
-                -1.22f * S, -0.04f * S,
-                -0.62f * S, -1.02f * S,
-                0f, -0.45f * S
+                -1.22f * s, -0.04f * s,
+                -0.62f * s, -1.02f * s,
+                0f, -0.45f * s
             )
             close()
         }
@@ -2528,8 +2526,6 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
         private var explosionAnimator: ValueAnimator? = null
         private val explosionDurationMs = 900L
         private val gravity = 1400f // px/s^2
-        private var explosionCenterX = 0f
-        private var explosionCenterY = 0f
 
         // 화면 중앙에 하트를 잠깐 표시 후 자동 폭발
         fun emitCenterOnce(sizeDp: Float = 200f, showDurationMs: Long = 500L) {
@@ -2613,13 +2609,11 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
             val dm = resources.displayMetrics
             val fallbackW = if (rw > 0) rw else dm.widthPixels
             val fallbackH = if (rh > 0) rh else dm.heightPixels
-            val minX = margin
-            val maxX = (fallbackW.toFloat() - margin).coerceAtLeast(minX + 1f)
-            val minY = margin
-            val maxY = (fallbackH.toFloat() - margin).coerceAtLeast(minY + 1f)
+            val maxX = (fallbackW.toFloat() - margin).coerceAtLeast(margin + 1f)
+            val maxY = (fallbackH.toFloat() - margin).coerceAtLeast(margin + 1f)
 
-            fun randomX(): Float = minX + Random.nextFloat() * (maxX - minX)
-            fun randomY(): Float = minY + Random.nextFloat() * (maxY - minY)
+            fun randomX(): Float = margin + Random.nextFloat() * (maxX - margin)
+            fun randomY(): Float = margin + Random.nextFloat() * (maxY - margin)
 
             // 0: 중앙, 1..6: 랜덤 위치
             repeat(totalExplosions) { index ->
@@ -2695,17 +2689,17 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
         private val baseHeartPath: Path = Path().apply {
             // Swift HeartShape와 동일한 하트 경로 (정규화 좌표 [-1,1]에 0.9 스케일 반영)
             reset()
-            val S = 0.9f
-            moveTo(0f, -0.45f * S)
+            val s = 0.9f
+            moveTo(0f, -0.45f * s)
             cubicTo(
-                0.62f * S, -1.02f * S,
-                1.22f * S, -0.04f * S,
-                0f, 0.65f * S
+                0.62f * s, -1.02f * s,
+                1.22f * s, -0.04f * s,
+                0f, 0.65f * s
             )
             cubicTo(
-                -1.22f * S, -0.04f * S,
-                -0.62f * S, -1.02f * S,
-                0f, -0.45f * S
+                -1.22f * s, -0.04f * s,
+                -0.62f * s, -1.02f * s,
+                0f, -0.45f * s
             )
             close()
         }
@@ -2809,17 +2803,17 @@ class LiveRoomActivity : BaseActivity<ActivityLiveRoomBinding>(ActivityLiveRoomB
         private val baseHeartPath: Path = Path().apply {
             // Swift HeartShape와 동일한 하트 경로 (정규화 좌표 [-1,1]에 0.9 스케일 반영)
             reset()
-            val S = 0.9f
-            moveTo(0f, -0.45f * S)
+            val s = 0.9f
+            moveTo(0f, -0.45f * s)
             cubicTo(
-                0.62f * S, -1.02f * S,
-                1.22f * S, -0.04f * S,
-                0f, 0.65f * S
+                0.62f * s, -1.02f * s,
+                1.22f * s, -0.04f * s,
+                0f, 0.65f * s
             )
             cubicTo(
-                -1.22f * S, -0.04f * S,
-                -0.62f * S, -1.02f * S,
-                0f, -0.45f * S
+                -1.22f * s, -0.04f * s,
+                -0.62f * s, -1.02f * s,
+                0f, -0.45f * s
             )
             close()
         }