diff --git a/README.md b/README.md
index d600d308..122bf061 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@
 ### Gradle
 
 ```
-compile 'be.zvz:KotlinInside:1.2.0'
+compile 'be.zvz:KotlinInside:1.2.1'
 ```
 
 ### Maven
@@ -16,7 +16,7 @@ compile 'be.zvz:KotlinInside:1.2.0'
 <dependency>
   <groupId>be.zvz</groupId>
   <artifactId>KotlinInside</artifactId>
-  <version>1.2.0</version>
+  <version>1.2.1</version>
   <type>pom</type>
 </dependency>
 ```
diff --git a/build.gradle b/build.gradle
index ddabf21a..a9c5638a 100644
--- a/build.gradle
+++ b/build.gradle
@@ -18,7 +18,7 @@ apply plugin: 'com.jfrog.bintray'
 apply plugin: 'com.github.dcendents.android-maven'
 
 def libName = 'KotlinInside'
-def libVersion = '1.2.0'
+def libVersion = '1.2.1'
 def libDesc = 'Unofficial DCInside API written in Kotlin'
 
 group = 'be.zvz'
diff --git a/src/main/java/be/zvz/kotlininside/http/DefaultHttpClient.java b/src/main/java/be/zvz/kotlininside/http/DefaultHttpClient.java
index 20d62152..bf7a493f 100644
--- a/src/main/java/be/zvz/kotlininside/http/DefaultHttpClient.java
+++ b/src/main/java/be/zvz/kotlininside/http/DefaultHttpClient.java
@@ -14,6 +14,11 @@
 public class DefaultHttpClient implements HttpInterface {
     private boolean enableGzipCompression;
 
+    /**
+     * DefaultHttpClient의 constructor입니다.
+     *
+     * @param gzip GZIP 압축을 사용할 것인지 유무
+     */
     public DefaultHttpClient(boolean gzip) {
         enableGzipCompression = gzip;
     }
diff --git a/src/main/kotlin/be/zvz/kotlininside/api/type/HeadText.kt b/src/main/kotlin/be/zvz/kotlininside/api/type/HeadText.kt
index 99af3dc1..d9e540cf 100644
--- a/src/main/kotlin/be/zvz/kotlininside/api/type/HeadText.kt
+++ b/src/main/kotlin/be/zvz/kotlininside/api/type/HeadText.kt
@@ -1,8 +1,8 @@
 package be.zvz.kotlininside.api.type
 
-data class HeadText(
-    val identifier: Int,
-    val name: String,
-    val level: Int,
-    val selected: Boolean
+data class HeadText @JvmOverloads constructor(
+        val identifier: Int,
+        val name: String,
+        val level: Int = 0,
+        val selected: Boolean = false
 )
\ No newline at end of file
diff --git a/src/main/kotlin/be/zvz/kotlininside/session/user/LoginUser.kt b/src/main/kotlin/be/zvz/kotlininside/session/user/LoginUser.kt
index 3565b8c3..b755694d 100644
--- a/src/main/kotlin/be/zvz/kotlininside/session/user/LoginUser.kt
+++ b/src/main/kotlin/be/zvz/kotlininside/session/user/LoginUser.kt
@@ -1,6 +1,6 @@
 package be.zvz.kotlininside.session.user
 
-abstract class LoginUser(
-    override val id: String,
-    override val password: String
+open class LoginUser(
+        override val id: String,
+        override val password: String
 ) : User
\ No newline at end of file