After caring for his wife for a long time, Do-chul accidentally witnesses a murder through a hospital window. Having made eye contact with the murderer, Do-chul is chased and runs. Do-chul narrowly escapes the danger, but he gets into an argument with a prostitute he meets at a late-night bar. In the heat of the argument, he accidentally kills the prostitute and becomes a murderer himself, frantically wandering the maze once more. He roams the alleys all night, trying to find a way out, but no exit is in sight. Before he knows it, he finds himself back at the spot where he first witnessed the murder...