diff --git a/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagActivity.kt b/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagActivity.kt
index e2589c74..a1e31ede 100644
--- a/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagActivity.kt
+++ b/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagActivity.kt
@@ -28,13 +28,13 @@ class ChangeTagActivity :
     private var _adapter: ChangeTagAdapter? = null
     private val adapter get() = requireNotNull(_adapter) { getString(R.string.adapter_not_initialized_error_msg) }
 
-    private val preferenceAnswers = MutableList(5) { 0 }
-
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
 
         initAdapter()
+        setTripId()
         initPreferenceList()
+        observeIsButtonValid()
         initItemDecoration()
         initChangeClickListener()
         initBackClickListener()
@@ -46,6 +46,10 @@ class ChangeTagActivity :
         binding.rvChangeTag.adapter = adapter
     }
 
+    private fun setTripId() {
+        tagViewModel.tripId = intent.getLongExtra(TRIP_ID, 0)
+    }
+
     private fun initPreferenceList() {
         if (intent != null) {
             val styleA = intent.getIntExtra(STYLE_A, 0)
@@ -64,34 +68,28 @@ class ChangeTagActivity :
                 )
             )
 
-            preferenceAnswers[0] = styleA
-            preferenceAnswers[1] = styleB
-            preferenceAnswers[2] = styleC
-            preferenceAnswers[3] = styleD
-            preferenceAnswers[4] = styleE
+            tagViewModel.setDefaultPreference(styleA, styleB, styleC, styleD, styleE)
         }
     }
 
     private fun preferenceTagClickListener(item: ProfilePreferenceData, checkedIndex: Int) {
-        preferenceAnswers[item.number.toInt() - 1] = checkedIndex
-        setButtonValid()
-        sendPreferenceInfo()
-    }
-
-    private fun setButtonValid() {
-        binding.btnChangeStart.isEnabled = true
-        binding.btnChangeStart.setTextColor(
-            colorOf(R.color.white_000)
-        )
+        tagViewModel.checkIsPreferenceChange(item.number.toInt(), checkedIndex)
     }
 
-    private fun sendPreferenceInfo() {
-        tagViewModel.tripId = intent.getLongExtra(TRIP_ID, 0)
-        tagViewModel.styleA.value = preferenceAnswers[0]
-        tagViewModel.styleB.value = preferenceAnswers[1]
-        tagViewModel.styleC.value = preferenceAnswers[2]
-        tagViewModel.styleD.value = preferenceAnswers[3]
-        tagViewModel.styleE.value = preferenceAnswers[4]
+    private fun observeIsButtonValid() {
+        tagViewModel.isButtonValid.flowWithLifecycle(lifecycle).onEach { state ->
+            if (state) {
+                binding.btnChangeStart.isEnabled = true
+                binding.btnChangeStart.setTextColor(
+                    colorOf(R.color.white_000)
+                )
+            } else {
+                binding.btnChangeStart.isEnabled = false
+                binding.btnChangeStart.setTextColor(
+                    colorOf(R.color.gray_200)
+                )
+            }
+        }.launchIn(lifecycleScope)
     }
 
     private fun initItemDecoration() {
diff --git a/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagViewModel.kt b/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagViewModel.kt
index c3ba95c6..5eb45e66 100644
--- a/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagViewModel.kt
+++ b/presentation/src/main/java/com/going/presentation/profile/participant/profiletag/changetag/ChangeTagViewModel.kt
@@ -8,7 +8,9 @@ import com.going.domain.entity.request.PreferenceChangeRequestModel
 import com.going.domain.repository.ProfileRepository
 import dagger.hilt.android.lifecycle.HiltViewModel
 import kotlinx.coroutines.flow.MutableSharedFlow
+import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.SharedFlow
+import kotlinx.coroutines.flow.StateFlow
 import kotlinx.coroutines.launch
 import javax.inject.Inject
 
@@ -20,13 +22,80 @@ class ChangeTagViewModel @Inject constructor(
     private val _preferencePatchState = MutableSharedFlow<Boolean>()
     val preferencePatchState: SharedFlow<Boolean> = _preferencePatchState
 
+    private val _isButtonValid = MutableStateFlow(false)
+    val isButtonValid: StateFlow<Boolean> = _isButtonValid
+
     var tripId: Long = 0
 
-    val styleA = MutableLiveData(0)
-    val styleB = MutableLiveData(0)
-    val styleC = MutableLiveData(0)
-    val styleD = MutableLiveData(0)
-    val styleE = MutableLiveData(0)
+    private val defaultStyleA = MutableLiveData(0)
+    private val defaultStyleB = MutableLiveData(0)
+    private val defaultStyleC = MutableLiveData(0)
+    private val defaultStyleD = MutableLiveData(0)
+    private val defaultStyleE = MutableLiveData(0)
+
+    private val styleA = MutableLiveData(0)
+    private val styleB = MutableLiveData(0)
+    private val styleC = MutableLiveData(0)
+    private val styleD = MutableLiveData(0)
+    private val styleE = MutableLiveData(0)
+
+    private var isStyleAChanged: Boolean = false
+    private var isStyleBChanged: Boolean = false
+    private var isStyleCChanged: Boolean = false
+    private var isStyleDChanged: Boolean = false
+    private var isStyleEChanged: Boolean = false
+
+    fun setDefaultPreference(styleA: Int, styleB: Int, styleC: Int, styleD: Int, styleE: Int) {
+        defaultStyleA.value = styleA
+        this.styleA.value = styleA
+
+        defaultStyleB.value = styleB
+        this.styleB.value = styleB
+
+        defaultStyleC.value = styleC
+        this.styleC.value = styleC
+
+        defaultStyleD.value = styleD
+        this.styleD.value = styleD
+
+        defaultStyleE.value = styleE
+        this.styleE.value = styleE
+    }
+
+    fun checkIsPreferenceChange(number: Int, index: Int) {
+        when (number) {
+            1 -> {
+                styleA.value = index
+                isStyleAChanged = index != defaultStyleA.value
+            }
+
+            2 -> {
+                styleB.value = index
+                isStyleBChanged = index != defaultStyleB.value
+            }
+
+            3 -> {
+                styleC.value = index
+                isStyleCChanged = index != defaultStyleC.value
+            }
+
+            4 -> {
+                styleD.value = index
+                isStyleDChanged = index != defaultStyleD.value
+            }
+
+            5 -> {
+                styleE.value = index
+                isStyleEChanged = index != defaultStyleE.value
+            }
+        }
+        checkIsButtonValid()
+    }
+
+    private fun checkIsButtonValid() {
+        _isButtonValid.value =
+            isStyleAChanged || isStyleBChanged || isStyleCChanged || isStyleDChanged || isStyleEChanged
+    }
 
     fun patchPreferenceTagToServer() {
         viewModelScope.launch {
diff --git a/presentation/src/main/res/layout/activity_change_tag.xml b/presentation/src/main/res/layout/activity_change_tag.xml
index ec146d3c..e193b149 100644
--- a/presentation/src/main/res/layout/activity_change_tag.xml
+++ b/presentation/src/main/res/layout/activity_change_tag.xml
@@ -76,7 +76,6 @@
             android:layout_marginHorizontal="24dp"
             android:layout_marginBottom="22dp"
             android:background="@drawable/sel_rounded_corner_button"
-            android:enabled="false"
             android:outlineProvider="none"
             android:text="@string/change_tag_btn_change"
             android:textColor="@color/gray_200"