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.

Two very different restless youths join a swimming competition for love and friendship which is, in fact, a rite of passage to growing up.

Tae-hun, a rugby player and author of children's books, and Mi-hae, an art major, are the most popular couple on campus. When Mi-hae's parents decide to emigrate to the USA, the two lovers declare independence from their support and move in together--a decision they will ultimately lead to disaster.