Detective Squad Chief Choi is about to be promoted. He throws a party for his coworkers to celebrate, but on the way home, a crime occurs, and he accidentally commits murder. Because of his promotion, he decides to cover up the crime. The next morning, TV news shows a body hanging from a crane at a construction site. Choi is astounded because the body hanging is that of the person he murdered the night before. He takes over the murder investigation.