Han Seung-Min is a popular professor at the Police University. He is also well-known as a forensic psychologist. His girlfriend Yoo Hee works as a criminal profiler. Suddenly, Han Seung-Min confesses that he killed Yoo Hee's father and other people. He eventually receives life in prison for his crimes. Yoo Hee does not believe his confession. She looks into his case for answers. This leads Yoo Hee to visit Han Seung-Min in prison and conduct 10 interviews with him.