Clinical psychologist Dr Tony Hill's uncanny ability to see into the minds of murderers means he finds it difficult to distance himself from disturbing cases.
Accused of killing her husband, a woman is offered a way out by a mysterious stranger: in exchange for a confession in her place, she must commit murder.
Detectives look to untangle the case of the Ragdoll Killer, who has killed six people and sewn their bodies into the shape of one grotesque body nicknamed the Ragdoll.
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.