diff --git a/app/src/main/java/com/flab/deepsleep/MainActivity.kt b/app/src/main/java/com/flab/deepsleep/MainActivity.kt
index f4a5614..bd8ddfa 100644
--- a/app/src/main/java/com/flab/deepsleep/MainActivity.kt
+++ b/app/src/main/java/com/flab/deepsleep/MainActivity.kt
@@ -34,7 +34,7 @@ class MainActivity : AppCompatActivity() {
 
         /* 버튼 누르면 검색 */
         val searchButton: ImageView = binding.searchButton
-        searchButton.setOnClickListener{
+        searchButton.setOnClickListener {
             val query: String = binding.editText.text.toString()
             photoViewModel.getSearchPhotos(query)
         }
@@ -45,10 +45,10 @@ class MainActivity : AppCompatActivity() {
         })
 
         /* 에러 관찰 */
-        photoViewModel.errorMessage.observe(this, Observer {
-                it -> it?.let {
-            showErrorDialog(it)
-        }
+        photoViewModel.errorMessage.observe(this, Observer { it ->
+            it?.let {
+                showErrorDialog(it)
+            }
         })
     }// ./onCreate()
 
@@ -56,6 +56,7 @@ class MainActivity : AppCompatActivity() {
         photoRecyclerView.layoutManager = LinearLayoutManager(this)
         photoRecyclerView.adapter = photoAdapter
     }
+
     private fun showErrorDialog(message: String) {
         AlertDialog.Builder(this)
             .setTitle("Error")
diff --git a/app/src/main/java/com/flab/deepsleep/data/source/PhotoPagingSource.kt b/app/src/main/java/com/flab/deepsleep/data/source/PhotoPagingSource.kt
index 4ffda5a..f05aabd 100644
--- a/app/src/main/java/com/flab/deepsleep/data/source/PhotoPagingSource.kt
+++ b/app/src/main/java/com/flab/deepsleep/data/source/PhotoPagingSource.kt
@@ -8,7 +8,8 @@ import com.flab.deepsleep.data.repo.UnplashRepositoryImpl
 
 class PhotoPagingSource(
     private val unplashRepositoryImpl: UnplashRepositoryImpl,
-    private val photoIdList: List<String>): PagingSource<Int, SinglePhoto>() {
+    private val photoIdList: List<String>
+) : PagingSource<Int, SinglePhoto>() {
 
     override suspend fun load(params: LoadParams<Int>): LoadResult<Int, SinglePhoto> {
         return try {
diff --git a/app/src/main/java/com/flab/deepsleep/ui/photo/PhotoAdapter.kt b/app/src/main/java/com/flab/deepsleep/ui/photo/PhotoAdapter.kt
index f9dd67c..848b3f4 100644
--- a/app/src/main/java/com/flab/deepsleep/ui/photo/PhotoAdapter.kt
+++ b/app/src/main/java/com/flab/deepsleep/ui/photo/PhotoAdapter.kt
@@ -37,8 +37,11 @@ class PhotoAdapter(private var images: List<String?>) :
 
     companion object {
         private val PHOTO_COMPARATOR = object : DiffUtil.ItemCallback<SinglePhoto>() {
-            override fun areItemsTheSame(oldItem: SinglePhoto, newItem: SinglePhoto): Boolean = oldItem.id == newItem.id
-            override fun areContentsTheSame(oldItem: SinglePhoto, newItem: SinglePhoto): Boolean = oldItem == newItem
+            override fun areItemsTheSame(oldItem: SinglePhoto, newItem: SinglePhoto): Boolean =
+                oldItem.id == newItem.id
+
+            override fun areContentsTheSame(oldItem: SinglePhoto, newItem: SinglePhoto): Boolean =
+                oldItem == newItem
         }
     }