diff --git a/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmFragment.kt b/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmFragment.kt
index 7ad134b..feb70e5 100644
--- a/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmFragment.kt
+++ b/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmFragment.kt
@@ -119,7 +119,7 @@ class RhythmFragment : BaseFragment<FragmentRhythmBinding>(R.layout.fragment_rhy
             ivRhythmBg.setImageResource(getResource("img_rhythm_bg_$color", DRAWABLE))
             lottieRhythmBg.apply {
                 setAnimation(getResource("stempo_rhythm_$color", RAW))
-                speed = viewModel.bpm / 120.00000000000F
+                speed = viewModel.bpm / FLOAT_120
                 playAnimation()
             }
         }
@@ -237,5 +237,7 @@ class RhythmFragment : BaseFragment<FragmentRhythmBinding>(R.layout.fragment_rhy
         private const val COLOR = "color"
         private const val DRAWABLE = "drawable"
         private const val RAW = "raw"
+
+        private const val FLOAT_120 =  120.00000000000000000000F
     }
 }
\ No newline at end of file
diff --git a/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmViewModel.kt b/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmViewModel.kt
index 9177d7a..0de4e0a 100644
--- a/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmViewModel.kt
+++ b/presentation/src/main/java/com/kkkk/presentation/main/rhythm/RhythmViewModel.kt
@@ -47,7 +47,7 @@ constructor(
     private fun initRhythmLevelFromDataStore() {
         val currentLevel = userRepository.getBpmLevel()
         filename = "stempo_level_$currentLevel"
-        bpm = 40 + currentLevel * 10
+        bpm = setBpm(currentLevel)
         _rhythmLevel.value = currentLevel
         tempRhythmLevel.value = currentLevel
     }
@@ -67,8 +67,8 @@ constructor(
     fun setRhythmLevel() {
         isSubmitted = true
         filename = "stempo_level_" + tempRhythmLevel.value.toString()
-        bpm = 40 + (tempRhythmLevel.value?.times(10) ?: 10)
-        _rhythmLevel.value = tempRhythmLevel.value ?: -1
+        bpm = setBpm(tempRhythmLevel.value ?: 1)
+        _rhythmLevel.value = tempRhythmLevel.value ?: 1
         userRepository.setBpmLevel(rhythmLevel.value)
     }
 
@@ -111,6 +111,8 @@ constructor(
         }
     }
 
+    fun setBpm(level: Int) = 40 + level * 10
+
     companion object {
         const val LEVEL_UNDEFINED = -1
     }