Through the Darkness

At a house in Daebong-dong, Gwangjin-gu, a woman was found dead with all of her clothes undressed. When everyone focuses on physical evidence, Ha Young is curious to find out why those criminals commit such hideous crimes. Meanwhile, Young Soo, the chief of Forensics Squad, sees the potential in him and wants to create a new team with him which analyzes criminals' behavior.

Ki Hoon gets arrested for murdering his girlfriend, and the Daebong-dong case is finally closed. However, Ha Young cannot let go of this case, as he believes that the real culprit is still out there, committing another crime. Therefore, he visits an inmate he met at his station and interviews him to study the minds of criminals. Meanwhile, Captain Park is not happy with him since he is going after the case he has already finished.

A five-year-old child was murdered in such a hideous way, and the Special Crime Squad is having a hard time because they don't have a suspect. Meanwhile, Ha Young and Young Soo go on the first interview of an inmate together, and he happens to be a mutilation murderer. Since Ha Young is confident with his analysis, he wants to help the Special Crime Squad but, Tae Gu finds them unreliable just like everybody else.

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