Jang Deuk-Cheon is the chief of a crime squad. At home, he is kind and friendly father to his daughter. He meets a human clone and gets involved in a shocking case. A battle takes place between human clones.

Baek Beom has worked as a forensic doctor for 10 years. He has a bad personality, but he is excellent with his work. Baek Beom does not open his mind to other people. Eun Sol is a rookie prosecutor with a warm heart. She has a bright personality and she comes from wealth family background. The forensic doctor and prosecutor work together to solve cases.