Moon is a goody-two-shoes who does her best not to worry her big brother. She keeps things organized and running, and looks up to her brother a lot. When they were younger, she used to be the one to protect him, and still has some traces of that. She likes singing and playing her guitar, but hides the fact that she performs in bars and other places because she fears her brother might get worried about her, and he is already in a pretty bad condition. She studies a lot so that she may enter the same college her brother goes to. She has a huge crush on Sun and wants to be confident like him, but she is scared of revealing her secret habits. She is kind and sweet and gets along with most people.