Dois jovens inquietos muito diferentes participam de uma competição de natação por amor e amizade, que é, de fato, um rito de passagem para o crescimento.
Jang Choon-dong is a traffic officer who aspires to become a homicide detective. He is assigned to go undercover to infiltrate a gangster network. Meanwhile, Lee Joong-dae, a member of Kwang-seob's gang, goes undercover himself by joining the police force. Joong-dae tries hard to gain favor with his squad leader in an effort to expose Choon-dong's identity.
