diff --git a/src/main/java/life/mosu/mosuserver/application/oauth/OAuthUserPersistenceProcessor.java b/src/main/java/life/mosu/mosuserver/application/oauth/OAuthUserPersistenceProcessor.java
index 83782f76..7104b594 100644
--- a/src/main/java/life/mosu/mosuserver/application/oauth/OAuthUserPersistenceProcessor.java
+++ b/src/main/java/life/mosu/mosuserver/application/oauth/OAuthUserPersistenceProcessor.java
@@ -23,17 +23,8 @@ public UserJpaEntity process(final OAuthUserInfo info) {
         return userRepository.findByPhoneNumber(
                         PhoneNumberUtil.formatPhoneNumber(info.phoneNumber()))
                 .map(existingUser -> {
-                    switch (existingUser.getProvider()) {
-                        case MOSU:
-                            if (existingUser.isPendingUser()) {
-                                throw new OAuthException("DUPLICATE");
-                            }
-                            break;
-                        case KAKAO:
-                            if (existingUser.isPendingUser()) {
-                                throw new OAuthException("KAKAO_DUPLICATE");
-                            }
-                            break;
+                    if (existingUser.isMosuUser()) {
+                        throw new OAuthException("DUPLICATE");
                     }
                     existingUser.updateOAuthUser(
                             info.gender(),
diff --git a/src/main/java/life/mosu/mosuserver/global/annotation/PasswordPattern.java b/src/main/java/life/mosu/mosuserver/global/annotation/PasswordPattern.java
index b2f88b96..664e3c25 100644
--- a/src/main/java/life/mosu/mosuserver/global/annotation/PasswordPattern.java
+++ b/src/main/java/life/mosu/mosuserver/global/annotation/PasswordPattern.java
@@ -9,7 +9,7 @@
 import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
-@Pattern(regexp = "^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)(?=.*[!@#$%^&*_/+=])[A-Za-z\\d!@#$%^&*_/+=]{8,20}$", message = "비밀번호 형식이 올바르지 않습니다.")
+@Pattern(regexp = "^(?=.*[A-Za-z])(?=.*\\d)(?=.*[!@#$%^&*_/+=])[A-Za-z\\d!@#$%^&*_/+=]{8,20}$", message = "비밀번호 형식이 올바르지 않습니다.")
 @NotBlank
 @Target({ElementType.FIELD, ElementType.PARAMETER})
 @Retention(RetentionPolicy.RUNTIME)
diff --git a/src/main/java/life/mosu/mosuserver/global/filter/Whitelist.java b/src/main/java/life/mosu/mosuserver/global/filter/Whitelist.java
index ac0e7486..f205c74e 100644
--- a/src/main/java/life/mosu/mosuserver/global/filter/Whitelist.java
+++ b/src/main/java/life/mosu/mosuserver/global/filter/Whitelist.java
@@ -34,9 +34,6 @@ public enum Whitelist {
     OAUTH2("/api/v1/oauth2", WhitelistMethod.ALL),
     OAUTH("/api/v1/oauth", WhitelistMethod.ALL),
 
-    // 삭제 예정
-    MASTER("/api/v1/master", WhitelistMethod.ALL),
-
     // 조회만 가능한 PATH
     EVENT("/api/v1/event", WhitelistMethod.GET),
     FAQ("/api/v1/faq", WhitelistMethod.GET),
diff --git a/src/main/java/life/mosu/mosuserver/presentation/auth/dto/request/SignUpAccountRequest.java b/src/main/java/life/mosu/mosuserver/presentation/auth/dto/request/SignUpAccountRequest.java
index f5691ac1..f9770260 100644
--- a/src/main/java/life/mosu/mosuserver/presentation/auth/dto/request/SignUpAccountRequest.java
+++ b/src/main/java/life/mosu/mosuserver/presentation/auth/dto/request/SignUpAccountRequest.java
@@ -26,7 +26,7 @@ public record SignUpAccountRequest(
         String id,
 
         @Schema(
-                description = "비밀번호는 8~20자의 영문 대/소문자, 숫자, 특수문자를 모두 포함해야 합니다.",
+                description = "비밀번호는 8~20자의 영문, 숫자, 특수문자를 모두 포함해야 합니다.",
                 example = "Mosu!1234"
         )
         @PasswordPattern String password,
diff --git a/src/main/java/life/mosu/mosuserver/presentation/user/dto/request/ChangePasswordRequest.java b/src/main/java/life/mosu/mosuserver/presentation/user/dto/request/ChangePasswordRequest.java
index a3ac59b7..ea8d6f19 100644
--- a/src/main/java/life/mosu/mosuserver/presentation/user/dto/request/ChangePasswordRequest.java
+++ b/src/main/java/life/mosu/mosuserver/presentation/user/dto/request/ChangePasswordRequest.java
@@ -5,7 +5,7 @@
 
 public record ChangePasswordRequest(
         @Schema(
-                description = "새로운 비밀번호는 8~20자의 영문 대/소문자, 숫자, 특수문자를 모두 포함해야 합니다.",
+                description = "새로운 비밀번호는 8~20자의 영문, 숫자, 특수문자를 모두 포함해야 합니다.",
                 example = "Mosu!1234"
         )
         @PasswordPattern