diff --git a/src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt b/src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt
index c68a0bf..339c3ec 100644
--- a/src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt
+++ b/src/main/kotlin/kr/co/vividnext/sodalive/explorer/ExplorerQueryRepository.kt
@@ -185,12 +185,14 @@ class ExplorerQueryRepository(
         val rotatedChars = characters.drop(offset) + characters.take(offset)
 
         val caseBuilder = Expressions.stringTemplate(
-            "CASE {0}",
-            rotatedChars
-                .withIndex()
-                .joinToString(" ") {
-                    "WHEN {0} THEN {1}".format(member.email.startsWith(it.value), it.index + 1)
-                }
+            "CASE",
+            rotatedChars.withIndex().joinToString(" ") {
+                "WHEN {0} LIKE {1} THEN {2}".format(
+                    member.email,
+                    "'" + it.value + "%'",
+                    it.index + 1
+                )
+            }
         )
 
         val randomExpression = Expressions.numberTemplate(Double::class.java, "function('rand')").asc()