Do Cheol has been taking care of his sick wife for a long time. One night, through a hospital window, he witnesses a murder in an alley. As the murderer sees him, Do Cheol runs along the narrow side street, chased by the murderer. After he just manages to tide over crisis, he goes to a bar and has a quarrel with a prostitute. Accidentally he kills her. Do Cheol, now a murderer, loses his way in the side street. He finds himself where he witnessed the murder at the first place.