Detective Squad Chief Choi (Son Hyun-Joo) is set for a promotion. He has a party with his co-workers 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 reveals a body is hanging from a crane at a construction site. Choi is shocked because the body hanging is the person he killed last night. He takes charge of the murder investigation.
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