A detective goes undercover in a drug ring and allies with a member of the drug ring in order to take it down.

Yongsoon, an 18-year-old high school student, is a daring, fearless girl who falls in love with the coach of her school’s athletics team. When she discovers that he has a lover, the pain is almost too much for her to bear. To make matters worse, her father brings home a new wife. In an effort to bring about a resolution, Yongsoon tells the coach that she is pregnant with his child and decides to meet his lover to finally settle things. They meet in a classroom, together with the coach and Yongsoon’s new stepmother. Can Yongsoon win back her love?

On the way to his mother’s funeral, a detective accidentally hits a person with his car. He takes the body with him and puts it into his mother’s coffin. The moment he feels relieved, he receives a call. This caller insists that he saw the detective’s hit-and-run, but instead of asking for money, he wants to know about the body’s whereabouts, leading to a do-or-die showdown of the witness and detective.