The hit man’s last mission: Keep the girl safe and sound. Ui-kang is a retired hit man. While his wife goes on a trip with her friend, she asks him a special favour to take care of her friend’s daughter. He doesn’t want to be bothered by the teenage girl but Yoon-ji gets stuck with juvenile delinquents and Ui-kang unavoidably uses a little bit of violence to protect her. However strangely, the juvenile delinquents are found dead and things start to get serious. Even worse, Yoon-ji is kidnapped by a teenager trafficking unit and Ui-kang is suspected of murder. He cannot fail his wife, he must get Yoon-ji back.