diff --git a/src/main/java/com/book/backend/domain/openapi/service/ResponseParser.java b/src/main/java/com/book/backend/domain/openapi/service/ResponseParser.java
index 3594719b..d63be42c 100644
--- a/src/main/java/com/book/backend/domain/openapi/service/ResponseParser.java
+++ b/src/main/java/com/book/backend/domain/openapi/service/ResponseParser.java
@@ -35,7 +35,7 @@ public LinkedList<RecommendListResponseDto> recommend(JSONObject jsonResponse) {
             JSONObject docsElement  = (JSONObject) o;
             JSONObject book = (JSONObject) docsElement.get("book");
 
-            // 중복 추천 체크 (open api 가 중복되는 책을 추천함;;)
+            // 중복 체크
             String duplicateCheckKey = book.getAsString("bookname") + book.getAsString("authors");
 
             if (duplicateCheckSet.add(duplicateCheckKey)) { // 중복 확인
@@ -60,6 +60,7 @@ public LinkedList<HotTrendResponseDto> hotTrend(JSONObject jsonResponse) {
         
         JSONArray results = (JSONArray) jsonResponse.get("results");
         LinkedList<HotTrendResponseDto> responseList = new LinkedList<>();
+        HashSet<String> duplicateCheckSet = new HashSet<>();
 
         if (results == null) {
             return responseList;
@@ -73,23 +74,28 @@ public LinkedList<HotTrendResponseDto> hotTrend(JSONObject jsonResponse) {
                 JSONObject docsElement = (JSONObject) value;
                 JSONObject doc = (JSONObject) docsElement.get("doc");
 
-                responseList.add(HotTrendResponseDto.builder()
-                        .no(doc.getAsString("no"))
-                        .difference(doc.getAsString("difference"))
-                        .baseWeekRank(doc.getAsString("baseWeekRank"))
-                        .pastWeekRank(doc.getAsString("pastWeekRank"))
-                        .bookname(doc.getAsString("bookname"))
-                        .authors(doc.getAsString("authors"))
-                        .publisher(doc.getAsString("publisher"))
-                        .publication_year(doc.getAsString("publication_year"))
-                        .isbn13(doc.getAsString("isbn13"))
-                        .addition_symbol(doc.getAsString("addition_symbol"))
-                        .vol(doc.getAsString("vol"))
-                        .class_no(doc.getAsString("class_no"))
-                        .class_nm(doc.getAsString("class_nm"))
-                        .bookImageURL(doc.getAsString("bookImageURL"))
-                        .bookDtlUrl(doc.getAsString("bookDtlUrl"))
-                        .build());
+                // 중복 체크
+                String duplicateCheckKey = doc.getAsString("bookname") + doc.getAsString("authors");
+
+                if (duplicateCheckSet.add(duplicateCheckKey)) { // 중복 확인
+                    responseList.add(HotTrendResponseDto.builder()
+                            .no(doc.getAsString("no"))
+                            .difference(doc.getAsString("difference"))
+                            .baseWeekRank(doc.getAsString("baseWeekRank"))
+                            .pastWeekRank(doc.getAsString("pastWeekRank"))
+                            .bookname(doc.getAsString("bookname"))
+                            .authors(doc.getAsString("authors"))
+                            .publisher(doc.getAsString("publisher"))
+                            .publication_year(doc.getAsString("publication_year"))
+                            .isbn13(doc.getAsString("isbn13"))
+                            .addition_symbol(doc.getAsString("addition_symbol"))
+                            .vol(doc.getAsString("vol"))
+                            .class_no(doc.getAsString("class_no"))
+                            .class_nm(doc.getAsString("class_nm"))
+                            .bookImageURL(doc.getAsString("bookImageURL"))
+                            .bookDtlUrl(doc.getAsString("bookDtlUrl"))
+                            .build());
+                }
             }
         }
         return responseList;
@@ -110,7 +116,9 @@ public LinkedList<LoanItemSrchResponseDto> loanTrend(JSONObject jsonResponse) {
             JSONObject docsElement = (JSONObject) o;
             JSONObject doc = (JSONObject) docsElement.get("doc");
 
+            // 중복 체크
             String duplicateCheckKey = doc.getAsString("bookname") + doc.getAsString("authors");
+
             if (duplicateCheckSet.add(duplicateCheckKey)) {
                 responseList.add(LoanItemSrchResponseDto.builder()
                         .no(doc.getAsString("no"))
@@ -170,21 +178,26 @@ public LinkedList<LoanItemSrchResponseDto> loanItemSrch(JSONObject jsonResponse)
             JSONObject docsElement = (JSONObject) o;
             JSONObject doc = (JSONObject) docsElement.get("doc");
 
-            responseList.add(LoanItemSrchResponseDto.builder()
-                    .no(doc.getAsString("no"))
-                    .ranking(doc.getAsString("ranking"))
-                    .bookname(doc.getAsString("bookname"))
-                    .authors(doc.getAsString("authors"))
-                    .publisher(doc.getAsString("publisher"))
-                    .publication_year(doc.getAsString("publication_year"))
-                    .isbn13(doc.getAsString("isbn13"))
-                    .addition_symbol(doc.getAsString("addition_symbol"))
-                    .class_no(doc.getAsString("class_no"))
-                    .class_nm(doc.getAsString("class_nm"))
-                    .loan_count(doc.getAsString("loan_count"))
-                    .bookImageURL(doc.getAsString("bookImageURL"))
-                    .bookDtlUrl(doc.getAsString("bookDtlUrl"))
-                    .build());
+            // 중복 체크
+            String duplicateCheckKey = doc.getAsString("bookname") + doc.getAsString("authors");
+
+            if (duplicateCheckSet.add(duplicateCheckKey)) { // 중복 확인
+                responseList.add(LoanItemSrchResponseDto.builder()
+                        .no(doc.getAsString("no"))
+                        .ranking(doc.getAsString("ranking"))
+                        .bookname(doc.getAsString("bookname"))
+                        .authors(doc.getAsString("authors"))
+                        .publisher(doc.getAsString("publisher"))
+                        .publication_year(doc.getAsString("publication_year"))
+                        .isbn13(doc.getAsString("isbn13"))
+                        .addition_symbol(doc.getAsString("addition_symbol"))
+                        .class_no(doc.getAsString("class_no"))
+                        .class_nm(doc.getAsString("class_nm"))
+                        .loan_count(doc.getAsString("loan_count"))
+                        .bookImageURL(doc.getAsString("bookImageURL"))
+                        .bookDtlUrl(doc.getAsString("bookDtlUrl"))
+                        .build());
+            }
         }
         return responseList;
     }
@@ -194,6 +207,7 @@ public LinkedList<SearchResponseDto> search(JSONObject jsonResponse){
 
         JSONArray docs = (JSONArray) jsonResponse.get("docs");
         LinkedList<SearchResponseDto> responseList = new LinkedList<>();
+        HashSet<String> duplicateCheckSet = new HashSet<>();
 
         if (docs == null) {
             return responseList;
@@ -203,17 +217,22 @@ public LinkedList<SearchResponseDto> search(JSONObject jsonResponse){
             JSONObject docsElement = (JSONObject) o;
             JSONObject doc = (JSONObject) docsElement.get("doc");
 
-            responseList.add(SearchResponseDto.builder()
-                    .bookname(doc.getAsString("bookname"))
-                    .authors(doc.getAsString("authors"))
-                    .publisher(doc.getAsString("publisher"))
-                    .publication_year(doc.getAsString("publication_year"))
-                    .isbn13(doc.getAsString("isbn13"))
-                    .vol(doc.getAsString("vol"))
-                    .bookImageURL(doc.getAsString("bookImageURL"))
-                    .bookDtlUrl(doc.getAsString("bookDtlUrl"))
-                    .loan_count(doc.getAsString("loan_count"))
-                    .build());
+            // 중복 체크
+            String duplicateCheckKey = doc.getAsString("bookname") + doc.getAsString("authors");
+
+            if (duplicateCheckSet.add(duplicateCheckKey)) { // 중복 확인
+                responseList.add(SearchResponseDto.builder()
+                        .bookname(doc.getAsString("bookname"))
+                        .authors(doc.getAsString("authors"))
+                        .publisher(doc.getAsString("publisher"))
+                        .publication_year(doc.getAsString("publication_year"))
+                        .isbn13(doc.getAsString("isbn13"))
+                        .vol(doc.getAsString("vol"))
+                        .bookImageURL(doc.getAsString("bookImageURL"))
+                        .bookDtlUrl(doc.getAsString("bookDtlUrl"))
+                        .loan_count(doc.getAsString("loan_count"))
+                        .build());
+            }
         }
         return responseList;
     }
@@ -228,14 +247,12 @@ public boolean loanAvailable(JSONObject jsonResponse) {
     public DetailResponseDto detail(JSONObject jsonResponse){
         log.trace("ResponseParser > detail()");
         JSONObject book = (JSONObject) jsonResponse.get("book");
-        JSONArray loanHistory = (JSONArray) jsonResponse.get("loanHistory");
         JSONArray loanGrps = (JSONArray) jsonResponse.get("loanGrps");
         JSONArray keywords = (JSONArray) jsonResponse.get("keywords");
         JSONArray coLoanBooks = (JSONArray) jsonResponse.get("coLoanBooks");
         JSONArray maniaRecBooks = (JSONArray) jsonResponse.get("maniaRecBooks");
         JSONArray readerRecBooks = (JSONArray) jsonResponse.get("readerRecBooks");
 
-        LinkedList<DetailResponseDto> responseList = new LinkedList<>();
         BookInfoDto bookInfoDto = BookInfoDto.builder()
                 .bookname(book.getAsString("bookname"))
                 .authors(book.getAsString("authors"))
@@ -271,22 +288,26 @@ public DetailResponseDto detail(JSONObject jsonResponse){
             keywordList.add(o.getAsString("word"));
         }
 
+        HashSet<String> duplicateCheckSet = new HashSet<>(); // 중복 체크
         LinkedList<CoLoanBooksDto> coLoanBooksList = new LinkedList<>();
         for (Object coLoanBook : coLoanBooks) {
             JSONObject o = (JSONObject) ((JSONObject) coLoanBook).get("book");
-            coLoanBooksList.add(CoLoanBooksDto.builder()
-                    .bookname(o.getAsString("bookname"))
-                    .authors(o.getAsString("authors"))
-                    .publisher(o.getAsString("publisher"))
-                    .publication_year(o.getAsString("publication_year"))
-                    .isbn13(o.getAsString("isbn13"))
-                    .vol(o.getAsString("vol"))
-                    .loanCnt(o.getAsString("loanCnt"))
-                    .build());
+            String duplicateCheckKey = o.getAsString("bookname") + o.getAsString("authors");
+            if (duplicateCheckSet.add(duplicateCheckKey)) { // 중복 확인
+                coLoanBooksList.add(CoLoanBooksDto.builder()
+                        .bookname(o.getAsString("bookname"))
+                        .authors(o.getAsString("authors"))
+                        .publisher(o.getAsString("publisher"))
+                        .publication_year(o.getAsString("publication_year"))
+                        .isbn13(o.getAsString("isbn13"))
+                        .vol(o.getAsString("vol"))
+                        .loanCnt(o.getAsString("loanCnt"))
+                        .build());
+            }
         }
 
         LinkedList<RecommendDto> recommendBooksList = new LinkedList<>();
-        HashSet<String> duplicateCheckSet = new HashSet<>(); // 중복 체크
+        duplicateCheckSet = new HashSet<>(); // 중복 체크
 
         for(Object maniaRecBook : maniaRecBooks) {
             JSONObject o = (JSONObject) ((JSONObject) maniaRecBook).get("book");