Lee Du-seok publishes an autobiography describing murders he committed after the statute of limitations expires. A detective and one of the victim's mothers search for the author while another killer begins a spree of murders.
Chun Jae In is an elite detective with a genius IQ, who guided by only facts, logic, and numbers. Meanwhile, Kim Dan is a rookie detective who can see ghosts. They work together to uncover a conspiracy involving a powerful organization.