diff --git a/app/build.gradle.kts b/app/build.gradle.kts
index cce61ec66..fb4952784 100644
--- a/app/build.gradle.kts
+++ b/app/build.gradle.kts
@@ -43,7 +43,8 @@ android {
             buildConfigField("String", "BASE_URL", gradleLocalProperties(rootDir).getProperty("debug.base.url"))
         }
         release {
-            isMinifyEnabled = false
+            isMinifyEnabled = true
+            isShrinkResources = true
             proguardFiles(
                 getDefaultProguardFile("proguard-android-optimize.txt"),
                 "proguard-rules.pro",
diff --git a/app/proguard-rules.pro b/app/proguard-rules.pro
index 481bb4348..e6a6ddec0 100644
--- a/app/proguard-rules.pro
+++ b/app/proguard-rules.pro
@@ -18,4 +18,13 @@
 
 # If you keep the line number information, uncomment this to
 # hide the original source file name.
-#-renamesourcefileattribute SourceFile
\ No newline at end of file
+#-renamesourcefileattribute SourceFile
+
+# kakao login
+-keep class com.kakao.sdk.**.model.* { <fields>; }
+-keep class * extends com.google.gson.TypeAdapter
+
+# https://github.com/square/okhttp/pull/6792
+-dontwarn org.bouncycastle.jsse.**
+-dontwarn org.conscrypt.*
+-dontwarn org.openjsse.**
diff --git a/app/src/main/res/drawable-xhdpi/bg_novel_detail_tooltip_frame.png b/app/src/main/res/drawable-xhdpi/bg_novel_detail_tooltip_frame.png
index 7fe13848d..099b49a41 100644
Binary files a/app/src/main/res/drawable-xhdpi/bg_novel_detail_tooltip_frame.png and b/app/src/main/res/drawable-xhdpi/bg_novel_detail_tooltip_frame.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_novel_detail_genre_frame.png b/app/src/main/res/drawable-xhdpi/ic_novel_detail_genre_frame.png
index 3b0cf5f3d..37b36bf71 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_novel_detail_genre_frame.png and b/app/src/main/res/drawable-xhdpi/ic_novel_detail_genre_frame.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_novel_detail_interest_deselected.png b/app/src/main/res/drawable-xhdpi/ic_novel_detail_interest_deselected.png
index ea2c6c081..8cbc6144c 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_novel_detail_interest_deselected.png and b/app/src/main/res/drawable-xhdpi/ic_novel_detail_interest_deselected.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_novel_detail_tooltip.png b/app/src/main/res/drawable-xhdpi/ic_novel_detail_tooltip.png
index 000ee5980..358e3c521 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_novel_detail_tooltip.png and b/app/src/main/res/drawable-xhdpi/ic_novel_detail_tooltip.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_filled.png b/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_filled.png
index 7f4dc4e0b..7e670e675 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_filled.png and b/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_filled.png differ
diff --git a/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_unfilled.png b/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_unfilled.png
index a24cee6d3..bd573aad5 100644
Binary files a/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_unfilled.png and b/app/src/main/res/drawable-xhdpi/ic_novel_rating_star_unfilled.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_load_fail.png b/app/src/main/res/drawable-xhdpi/img_load_fail.png
index 11248e27b..fce1546a9 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_load_fail.png and b/app/src/main/res/drawable-xhdpi/img_load_fail.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_loading_thumbnail.png b/app/src/main/res/drawable-xhdpi/img_loading_thumbnail.png
index 6d6990ce7..ca2b5a73b 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_loading_thumbnail.png and b/app/src/main/res/drawable-xhdpi/img_loading_thumbnail.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_login_1.png b/app/src/main/res/drawable-xhdpi/img_login_1.png
index 3de53df95..fd0aa2bfb 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_login_1.png and b/app/src/main/res/drawable-xhdpi/img_login_1.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_login_2.png b/app/src/main/res/drawable-xhdpi/img_login_2.png
index ef3133ac6..7071d5e9b 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_login_2.png and b/app/src/main/res/drawable-xhdpi/img_login_2.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_login_3.png b/app/src/main/res/drawable-xhdpi/img_login_3.png
index a401e67f8..aec0e0216 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_login_3.png and b/app/src/main/res/drawable-xhdpi/img_login_3.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_login_4.png b/app/src/main/res/drawable-xhdpi/img_login_4.png
index 50e7116b0..95f960b12 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_login_4.png and b/app/src/main/res/drawable-xhdpi/img_login_4.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_login_request.png b/app/src/main/res/drawable-xhdpi/img_login_request.png
index dfa2ade48..f0f7d4465 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_login_request.png and b/app/src/main/res/drawable-xhdpi/img_login_request.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_my_library_empty_cat.png b/app/src/main/res/drawable-xhdpi/img_my_library_empty_cat.png
index 06dfb64ee..0107610d8 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_my_library_empty_cat.png and b/app/src/main/res/drawable-xhdpi/img_my_library_empty_cat.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_novel_info_none.png b/app/src/main/res/drawable-xhdpi/img_novel_info_none.png
index 58c75b6c8..1db89c176 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_novel_info_none.png and b/app/src/main/res/drawable-xhdpi/img_novel_info_none.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_other_user_page_no_public.png b/app/src/main/res/drawable-xhdpi/img_other_user_page_no_public.png
index 73121f7c8..ff264a476 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_other_user_page_no_public.png and b/app/src/main/res/drawable-xhdpi/img_other_user_page_no_public.png differ
diff --git a/app/src/main/res/drawable-xhdpi/img_splash_background.png b/app/src/main/res/drawable-xhdpi/img_splash_background.png
index 6f45eda21..1f5747d6c 100644
Binary files a/app/src/main/res/drawable-xhdpi/img_splash_background.png and b/app/src/main/res/drawable-xhdpi/img_splash_background.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/bg_novel_detail_tooltip_frame.png b/app/src/main/res/drawable-xxhdpi/bg_novel_detail_tooltip_frame.png
index 1c7ff2cc5..64535b94d 100644
Binary files a/app/src/main/res/drawable-xxhdpi/bg_novel_detail_tooltip_frame.png and b/app/src/main/res/drawable-xxhdpi/bg_novel_detail_tooltip_frame.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_genre_frame.png b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_genre_frame.png
index 18ee754a1..7dd085ea3 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_genre_frame.png and b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_genre_frame.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_interest_deselected.png b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_interest_deselected.png
index ffe5a1e18..273d4f339 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_interest_deselected.png and b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_interest_deselected.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_tooltip.png b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_tooltip.png
index 9ef029d54..8219e096f 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_novel_detail_tooltip.png and b/app/src/main/res/drawable-xxhdpi/ic_novel_detail_tooltip.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_filled.png b/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_filled.png
index 099bb3bb3..e977c0cb6 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_filled.png and b/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_filled.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_unfilled.png b/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_unfilled.png
index 9ea43673b..7cd604897 100644
Binary files a/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_unfilled.png and b/app/src/main/res/drawable-xxhdpi/ic_novel_rating_star_unfilled.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_load_fail.png b/app/src/main/res/drawable-xxhdpi/img_load_fail.png
index 9bf3b52a7..4f897706b 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_load_fail.png and b/app/src/main/res/drawable-xxhdpi/img_load_fail.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_loading_thumbnail.png b/app/src/main/res/drawable-xxhdpi/img_loading_thumbnail.png
index f116a3005..0011eac66 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_loading_thumbnail.png and b/app/src/main/res/drawable-xxhdpi/img_loading_thumbnail.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_login_1.png b/app/src/main/res/drawable-xxhdpi/img_login_1.png
index f6b2e91c9..77d740ffa 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_login_1.png and b/app/src/main/res/drawable-xxhdpi/img_login_1.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_login_2.png b/app/src/main/res/drawable-xxhdpi/img_login_2.png
index dd0ef0aad..af49d9b52 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_login_2.png and b/app/src/main/res/drawable-xxhdpi/img_login_2.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_login_3.png b/app/src/main/res/drawable-xxhdpi/img_login_3.png
index 37e9d3ab9..974e484fd 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_login_3.png and b/app/src/main/res/drawable-xxhdpi/img_login_3.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_login_4.png b/app/src/main/res/drawable-xxhdpi/img_login_4.png
index 539fedb9d..be3b4b25a 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_login_4.png and b/app/src/main/res/drawable-xxhdpi/img_login_4.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_login_request.png b/app/src/main/res/drawable-xxhdpi/img_login_request.png
index 66d95198f..03ae6ab07 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_login_request.png and b/app/src/main/res/drawable-xxhdpi/img_login_request.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_my_library_empty_cat.png b/app/src/main/res/drawable-xxhdpi/img_my_library_empty_cat.png
index 746a2467f..edd762663 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_my_library_empty_cat.png and b/app/src/main/res/drawable-xxhdpi/img_my_library_empty_cat.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_novel_info_none.png b/app/src/main/res/drawable-xxhdpi/img_novel_info_none.png
index 176a0efde..cf8dd8613 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_novel_info_none.png and b/app/src/main/res/drawable-xxhdpi/img_novel_info_none.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_other_user_page_no_public.png b/app/src/main/res/drawable-xxhdpi/img_other_user_page_no_public.png
index f670cb97b..ec16bf7c5 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_other_user_page_no_public.png and b/app/src/main/res/drawable-xxhdpi/img_other_user_page_no_public.png differ
diff --git a/app/src/main/res/drawable-xxhdpi/img_splash_background.png b/app/src/main/res/drawable-xxhdpi/img_splash_background.png
index ae2e94b7c..3ee030543 100644
Binary files a/app/src/main/res/drawable-xxhdpi/img_splash_background.png and b/app/src/main/res/drawable-xxhdpi/img_splash_background.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_load_fail.png b/app/src/main/res/drawable-xxxhdpi/img_load_fail.png
new file mode 100644
index 000000000..4f897706b
Binary files /dev/null and b/app/src/main/res/drawable-xxxhdpi/img_load_fail.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_loading_thumbnail.png b/app/src/main/res/drawable-xxxhdpi/img_loading_thumbnail.png
new file mode 100644
index 000000000..0011eac66
Binary files /dev/null and b/app/src/main/res/drawable-xxxhdpi/img_loading_thumbnail.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_login_1.png b/app/src/main/res/drawable-xxxhdpi/img_login_1.png
index a623f8fd8..b1580f240 100644
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diff --git a/app/src/main/res/drawable-xxxhdpi/img_login_2.png b/app/src/main/res/drawable-xxxhdpi/img_login_2.png
index 0339ed6d1..0a146d470 100644
Binary files a/app/src/main/res/drawable-xxxhdpi/img_login_2.png and b/app/src/main/res/drawable-xxxhdpi/img_login_2.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_login_3.png b/app/src/main/res/drawable-xxxhdpi/img_login_3.png
index c806839ec..f6742d246 100644
Binary files a/app/src/main/res/drawable-xxxhdpi/img_login_3.png and b/app/src/main/res/drawable-xxxhdpi/img_login_3.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_login_4.png b/app/src/main/res/drawable-xxxhdpi/img_login_4.png
index f035878e4..e53538240 100644
Binary files a/app/src/main/res/drawable-xxxhdpi/img_login_4.png and b/app/src/main/res/drawable-xxxhdpi/img_login_4.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_login_request.png b/app/src/main/res/drawable-xxxhdpi/img_login_request.png
index 5269411e1..428dce6a8 100644
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diff --git a/app/src/main/res/drawable-xxxhdpi/img_my_library_empty_cat.png b/app/src/main/res/drawable-xxxhdpi/img_my_library_empty_cat.png
index 942651955..8051c4885 100644
Binary files a/app/src/main/res/drawable-xxxhdpi/img_my_library_empty_cat.png and b/app/src/main/res/drawable-xxxhdpi/img_my_library_empty_cat.png differ
diff --git a/app/src/main/res/drawable-xxxhdpi/img_other_user_page_no_public.png b/app/src/main/res/drawable-xxxhdpi/img_other_user_page_no_public.png
index acb20c36c..507b26263 100644
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diff --git a/app/src/main/res/drawable-xxxhdpi/img_splash_background.png b/app/src/main/res/drawable-xxxhdpi/img_splash_background.png
index 40f3a3435..2afb06e20 100644
Binary files a/app/src/main/res/drawable-xxxhdpi/img_splash_background.png and b/app/src/main/res/drawable-xxxhdpi/img_splash_background.png differ
diff --git a/app/src/main/res/drawable/bg_novel_detail_tooltip_frame.png b/app/src/main/res/drawable/bg_novel_detail_tooltip_frame.png
index bd4f8894e..6b88dfdcc 100644
Binary files a/app/src/main/res/drawable/bg_novel_detail_tooltip_frame.png and b/app/src/main/res/drawable/bg_novel_detail_tooltip_frame.png differ
diff --git a/app/src/main/res/drawable/ic_novel_detail_genre_frame.png b/app/src/main/res/drawable/ic_novel_detail_genre_frame.png
index fb2037c74..23af9ba6f 100644
Binary files a/app/src/main/res/drawable/ic_novel_detail_genre_frame.png and b/app/src/main/res/drawable/ic_novel_detail_genre_frame.png differ
diff --git a/app/src/main/res/drawable/ic_novel_detail_interest_deselected.png b/app/src/main/res/drawable/ic_novel_detail_interest_deselected.png
index 4941d86ec..4c9f2c4e6 100644
Binary files a/app/src/main/res/drawable/ic_novel_detail_interest_deselected.png and b/app/src/main/res/drawable/ic_novel_detail_interest_deselected.png differ
diff --git a/app/src/main/res/drawable/ic_novel_detail_tooltip.png b/app/src/main/res/drawable/ic_novel_detail_tooltip.png
index 0c9a34cf7..c1642e531 100644
Binary files a/app/src/main/res/drawable/ic_novel_detail_tooltip.png and b/app/src/main/res/drawable/ic_novel_detail_tooltip.png differ
diff --git a/app/src/main/res/drawable/ic_novel_rating_star_filled.png b/app/src/main/res/drawable/ic_novel_rating_star_filled.png
index fc29f7e77..11adf72f8 100644
Binary files a/app/src/main/res/drawable/ic_novel_rating_star_filled.png and b/app/src/main/res/drawable/ic_novel_rating_star_filled.png differ
diff --git a/app/src/main/res/drawable/ic_novel_rating_star_unfilled.png b/app/src/main/res/drawable/ic_novel_rating_star_unfilled.png
index 4ad4da6d9..9828dfba0 100644
Binary files a/app/src/main/res/drawable/ic_novel_rating_star_unfilled.png and b/app/src/main/res/drawable/ic_novel_rating_star_unfilled.png differ
diff --git a/app/src/main/res/drawable/img_blocked_users_avatar_test.png b/app/src/main/res/drawable/img_blocked_users_avatar_test.png
index a745d1668..5ae307438 100644
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diff --git a/app/src/main/res/drawable/img_explore_test_cover.jpeg b/app/src/main/res/drawable/img_explore_test_cover.jpeg
deleted file mode 100644
index 1546e22b8..000000000
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diff --git a/app/src/main/res/drawable/img_load_fail.png b/app/src/main/res/drawable/img_load_fail.png
index fe94f93e4..a2352d17e 100644
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diff --git a/app/src/main/res/drawable/img_loading_thumbnail.png b/app/src/main/res/drawable/img_loading_thumbnail.png
index 70e97c848..7ee24d173 100644
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diff --git a/app/src/main/res/drawable/img_login_1.png b/app/src/main/res/drawable/img_login_1.png
index a727b20ab..40a9659bb 100644
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diff --git a/app/src/main/res/drawable/img_login_2.png b/app/src/main/res/drawable/img_login_2.png
index 3ec46c0d1..f766de0be 100644
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diff --git a/app/src/main/res/drawable/img_login_3.png b/app/src/main/res/drawable/img_login_3.png
index 7c0eca3e5..19e06d973 100644
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diff --git a/app/src/main/res/drawable/img_login_4.png b/app/src/main/res/drawable/img_login_4.png
index c3cf5f2e4..a355bbc2f 100644
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diff --git a/app/src/main/res/drawable/img_login_request.png b/app/src/main/res/drawable/img_login_request.png
index 429782abc..d2b282208 100644
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diff --git a/app/src/main/res/drawable/img_normal_explore_test_cover.jpeg b/app/src/main/res/drawable/img_normal_explore_test_cover.jpeg
deleted file mode 100644
index 61ce04c45..000000000
Binary files a/app/src/main/res/drawable/img_normal_explore_test_cover.jpeg and /dev/null differ
diff --git a/app/src/main/res/drawable/img_novel_info_none.png b/app/src/main/res/drawable/img_novel_info_none.png
index cecb6836e..5bc352238 100644
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diff --git a/app/src/main/res/drawable/img_splash_background.png b/app/src/main/res/drawable/img_splash_background.png
index 3de29a58e..4ac260e52 100644
Binary files a/app/src/main/res/drawable/img_splash_background.png and b/app/src/main/res/drawable/img_splash_background.png differ
diff --git a/app/src/main/res/drawable/img_user_pofile.png b/app/src/main/res/drawable/img_user_pofile.png
index f160655ba..e0d8706ae 100644
Binary files a/app/src/main/res/drawable/img_user_pofile.png and b/app/src/main/res/drawable/img_user_pofile.png differ
diff --git a/app/src/main/res/layout/item_detail_explore_result.xml b/app/src/main/res/layout/item_detail_explore_result.xml
index 4e256e434..f9d53759c 100644
--- a/app/src/main/res/layout/item_detail_explore_result.xml
+++ b/app/src/main/res/layout/item_detail_explore_result.xml
@@ -32,7 +32,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <ImageView
             android:id="@+id/iv_detail_explore_result_interested"
@@ -111,4 +111,4 @@
             app:layout_constraintTop_toBottomOf="@id/tv_detail_explore_result_novel_title"
             tools:text="이보라" />
     </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
\ No newline at end of file
+</layout>
diff --git a/app/src/main/res/layout/item_normal_explore.xml b/app/src/main/res/layout/item_normal_explore.xml
index a86ade40c..f169619ea 100644
--- a/app/src/main/res/layout/item_normal_explore.xml
+++ b/app/src/main/res/layout/item_normal_explore.xml
@@ -33,7 +33,7 @@
             app:layout_constraintHorizontal_chainStyle="packed"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <TextView
             android:id="@+id/tv_normal_explore_result_title"
@@ -120,4 +120,4 @@
             app:layout_constraintTop_toBottomOf="@id/tv_normal_explore_result_title"
             tools:hint="김명지손명지 박명지 이명지, 안녕하세요, 작가 손입니다. 반갑스빈다." />
     </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
\ No newline at end of file
+</layout>
diff --git a/app/src/main/res/layout/item_popular_novel.xml b/app/src/main/res/layout/item_popular_novel.xml
index c430dcb84..6c01eef68 100644
--- a/app/src/main/res/layout/item_popular_novel.xml
+++ b/app/src/main/res/layout/item_popular_novel.xml
@@ -55,7 +55,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toBottomOf="@id/tv_popular_novel_title"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <androidx.constraintlayout.widget.ConstraintLayout
             android:id="@+id/cl_popular_novel_in_short"
@@ -160,4 +160,4 @@
 
         </androidx.constraintlayout.widget.ConstraintLayout>
     </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
\ No newline at end of file
+</layout>
diff --git a/app/src/main/res/layout/item_recommended_novel_by_user_taste.xml b/app/src/main/res/layout/item_recommended_novel_by_user_taste.xml
index 8e75e6f8b..57ab949a5 100644
--- a/app/src/main/res/layout/item_recommended_novel_by_user_taste.xml
+++ b/app/src/main/res/layout/item_recommended_novel_by_user_taste.xml
@@ -31,7 +31,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <ImageView
             android:id="@+id/iv_taste_novel_interest"
@@ -106,4 +106,4 @@
             tools:text="이보라" />
 
     </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
\ No newline at end of file
+</layout>
diff --git a/app/src/main/res/layout/item_search_novel.xml b/app/src/main/res/layout/item_search_novel.xml
index 8827689b5..69955d9cd 100644
--- a/app/src/main/res/layout/item_search_novel.xml
+++ b/app/src/main/res/layout/item_search_novel.xml
@@ -31,7 +31,7 @@
             app:layout_constraintHorizontal_chainStyle="packed"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <TextView
             android:id="@+id/tv_create_feed_search_novel_title"
diff --git a/app/src/main/res/layout/item_soso_pick.xml b/app/src/main/res/layout/item_soso_pick.xml
index e9f8a2ec9..a1ac0e0b8 100644
--- a/app/src/main/res/layout/item_soso_pick.xml
+++ b/app/src/main/res/layout/item_soso_pick.xml
@@ -27,7 +27,7 @@
             android:layout_height="180dp"
             android:layout_marginEnd="6dp"
             android:contentDescription="@null"
-            android:src="@drawable/img_explore_test_cover"
+            android:src="@drawable/img_loading_thumbnail"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent" />
@@ -50,4 +50,4 @@
             app:layout_constraintTop_toBottomOf="@id/iv_explore_soso_pick_novel_cover"
             tools:hint="네가 죽어야 내가 살아 왜냐면 나는 악독한 악역 영애니까" />
     </androidx.constraintlayout.widget.ConstraintLayout>
-</layout>
\ No newline at end of file
+</layout>
diff --git a/app/src/main/res/layout/item_storage_novel.xml b/app/src/main/res/layout/item_storage_novel.xml
index c4a9ee479..1012a03ea 100644
--- a/app/src/main/res/layout/item_storage_novel.xml
+++ b/app/src/main/res/layout/item_storage_novel.xml
@@ -25,7 +25,7 @@
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <TextView
             android:id="@+id/tv_storage_novel_title"
diff --git a/app/src/main/res/layout/item_user_interest_feed.xml b/app/src/main/res/layout/item_user_interest_feed.xml
index d05e39b79..2da8338e4 100644
--- a/app/src/main/res/layout/item_user_interest_feed.xml
+++ b/app/src/main/res/layout/item_user_interest_feed.xml
@@ -33,7 +33,7 @@
             android:layout_marginStart="16dp"
             app:layout_constraintStart_toStartOf="parent"
             app:layout_constraintTop_toTopOf="parent"
-            tools:src="@drawable/img_normal_explore_test_cover" />
+            tools:src="@drawable/img_loading_thumbnail" />
 
         <LinearLayout
             android:id="@+id/ll_user_interest_rating"