Choi Minji was a girl who lived a pretty peaceful life. She had really nice friends, amazing grades, and a family who loved her. However, that all changed when a gang known as BAP killed her parents. Now all Minji cares about is killing that bastard leader of theirs Bang Yong Guk. She even takes the identity of her twin brother Choi Junhong and tries to infiltrate the gang. But will she meet her goal or will she slowly start to fall for the killer?