This film tells the story of a chief police investigator who was involved in the murder. But because it will be promoted, she decided to cover up the crime. The story begins when a chief police investigator, Choi (Son Hyun-joo) held a party with his colleagues as a celebration of her that will be promoted in office. But, on the way home, she did not intentionally murder. Because it will be promoted, he decided to cover up the crime. The next day, Choi found the body he killed it depends on a crane in front of the police station. The existence of the body was immediately the center of attention and Choi was assigned to handle the case. The handling of the case, Choi tried to manipulate and destroy evidence.