diff --git a/apis/src/main/kotlin/org/yapp/apis/auth/util/IsbnConverter.kt b/apis/src/main/kotlin/org/yapp/apis/auth/util/IsbnConverter.kt
index caa5ba26..90a005f9 100644
--- a/apis/src/main/kotlin/org/yapp/apis/auth/util/IsbnConverter.kt
+++ b/apis/src/main/kotlin/org/yapp/apis/auth/util/IsbnConverter.kt
@@ -11,13 +11,8 @@ object IsbnConverter {
 
     fun toIsbn13(isbn10: String?): String? {
         val sanitized = isbn10?.replace("-", "")?.uppercase()
-
-        if (sanitized.isNullOrBlank() || sanitized.length != ISBN10_LENGTH) {
-            return null
-        }
-        if (!sanitized.matches(Regex(RegexUtils.ISBN10_PATTERN))) {
-            return null
-        }
+            ?.takeIf { it.length == ISBN10_LENGTH && it.matches(Regex(RegexUtils.ISBN10_PATTERN)) }
+            ?: return null
 
         val stem = ISBN13_PREFIX + sanitized.substring(0, ISBN10_LENGTH - 1)
 
diff --git a/apis/src/main/kotlin/org/yapp/apis/book/dto/response/BookDetailResponse.kt b/apis/src/main/kotlin/org/yapp/apis/book/dto/response/BookDetailResponse.kt
index 14011d0c..7765ac2f 100644
--- a/apis/src/main/kotlin/org/yapp/apis/book/dto/response/BookDetailResponse.kt
+++ b/apis/src/main/kotlin/org/yapp/apis/book/dto/response/BookDetailResponse.kt
@@ -26,11 +26,15 @@ data class BookDetailResponse private constructor(
 
     companion object {
         private const val DEFAULT_MAX_PAGE_COUNT = 4032
-        
+
         fun from(response: AladinBookDetailResponse, userBookStatus: BookStatus = BookStatus.BEFORE_REGISTRATION): BookDetailResponse {
             val item = response.item.firstOrNull()
                 ?: throw IllegalArgumentException("No book item found in detail response.")
 
+            val isbn13 = item.isbn13?.takeIf { it.isNotBlank() }
+                ?: IsbnConverter.toIsbn13(item.isbn?.takeIf { it.isNotBlank() })
+                ?: throw IllegalArgumentException("Either isbn13 or isbn must be provided")
+
             return BookDetailResponse(
                 version = response.version,
                 title = item.title,
@@ -39,7 +43,7 @@ data class BookDetailResponse private constructor(
                 pubDate = item.pubDate ?: "",
                 description = item.description ?: "",
                 mallType = item.mallType,
-                isbn13 = item.isbn13 ?: IsbnConverter.toIsbn13(item.isbn) ?: throw IllegalArgumentException("Either isbn13 or isbn must be provided"),
+                isbn13 = isbn13,
                 coverImageUrl = item.cover,
                 categoryName = item.categoryName,
                 publisher = item.publisher ?: "",
diff --git a/apis/src/main/kotlin/org/yapp/apis/book/service/AladinBookQueryService.kt b/apis/src/main/kotlin/org/yapp/apis/book/service/AladinBookQueryService.kt
index 02ca2d99..c6a94a54 100644
--- a/apis/src/main/kotlin/org/yapp/apis/book/service/AladinBookQueryService.kt
+++ b/apis/src/main/kotlin/org/yapp/apis/book/service/AladinBookQueryService.kt
@@ -10,6 +10,8 @@ import org.yapp.apis.book.dto.response.BookDetailResponse
 import org.yapp.apis.book.dto.response.BookSearchResponse
 import org.yapp.apis.book.exception.BookErrorCode
 import org.yapp.apis.book.exception.BookException
+import org.yapp.apis.util.IsbnConverter
+import org.yapp.globalutils.validator.IsbnValidator
 import org.yapp.infra.external.aladin.AladinApi
 import org.yapp.infra.external.aladin.request.AladinBookLookupRequest
 import org.yapp.infra.external.aladin.request.AladinBookSearchRequest
@@ -42,7 +44,31 @@ class AladinBookQueryService(
                 log.error("Failed to call Aladin search API for request: '$request'", exception)
                 throw BookException(BookErrorCode.ALADIN_API_SEARCH_FAILED, exception.message)
             }
-        return BookSearchResponse.from(response)
+
+        val filteredItems = response.item.filter { item ->
+            val isbn13 = item.isbn13?.takeIf { it.isNotBlank() } 
+                ?: item.isbn?.let { IsbnConverter.toIsbn13(it) }
+            
+            isbn13?.let { 
+                IsbnValidator.isValidIsbn(it) && !it.startsWith("K", ignoreCase = true)
+            } ?: false
+        }
+
+        val filteredResponse = AladinSearchResponse(
+            version = response.version,
+            title = response.title,
+            link = response.link,
+            pubDate = response.pubDate,
+            totalResults = filteredItems.size,
+            startIndex = response.startIndex,
+            itemsPerPage = response.itemsPerPage,
+            query = response.query,
+            searchCategoryId = response.searchCategoryId,
+            searchCategoryName = response.searchCategoryName,
+            item = filteredItems
+        )
+
+        return BookSearchResponse.from(filteredResponse)
     }
 
     override fun getBookDetail(@Valid request: BookDetailRequest): BookDetailResponse {
diff --git a/global-utils/src/main/kotlin/org/yapp/globalutils/validator/IsbnValidator.kt b/global-utils/src/main/kotlin/org/yapp/globalutils/validator/IsbnValidator.kt
index 2177f14f..ab55042a 100644
--- a/global-utils/src/main/kotlin/org/yapp/globalutils/validator/IsbnValidator.kt
+++ b/global-utils/src/main/kotlin/org/yapp/globalutils/validator/IsbnValidator.kt
@@ -1,9 +1,12 @@
 package org.yapp.globalutils.validator
 
+import org.yapp.globalutils.util.RegexUtils
+
 object IsbnValidator {
-    private val ISBN_REGEX = Regex("^(.{10}|.{13})$")
+    private val ISBN10_REGEX = Regex(RegexUtils.ISBN10_PATTERN)
+    private val ISBN13_REGEX = Regex(RegexUtils.ISBN13_PATTERN)
 
     fun isValidIsbn(isbn: String): Boolean {
-        return isbn.matches(ISBN_REGEX)
+        return isbn.matches(ISBN10_REGEX) || isbn.matches(ISBN13_REGEX)
     }
 }
diff --git a/infra/src/main/kotlin/org/yapp/infra/external/aladin/response/AladinSearchResponse.kt b/infra/src/main/kotlin/org/yapp/infra/external/aladin/response/AladinSearchResponse.kt
index 925d631c..2ec90915 100644
--- a/infra/src/main/kotlin/org/yapp/infra/external/aladin/response/AladinSearchResponse.kt
+++ b/infra/src/main/kotlin/org/yapp/infra/external/aladin/response/AladinSearchResponse.kt
@@ -5,7 +5,7 @@ import com.fasterxml.jackson.annotation.JsonProperty
 import java.math.BigDecimal
 
 @JsonIgnoreProperties(ignoreUnknown = true)
-data class AladinSearchResponse internal constructor(
+data class AladinSearchResponse(
     @JsonProperty("version") val version: String?,
     @JsonProperty("title") val title: String?,
     @JsonProperty("link") val link: String?,
@@ -20,7 +20,7 @@ data class AladinSearchResponse internal constructor(
 )
 
 @JsonIgnoreProperties(ignoreUnknown = true)
-data class AladinSearchItem internal constructor(
+data class AladinSearchItem(
     @JsonProperty("title") val title: String,
     @JsonProperty("link") val link: String,
     @JsonProperty("author") val author: String?,