A painful but exciting story of Oh Soo-jae, a cold lawyer who has become empty while pursuing only success, and Gong Chan, a law school student who is not afraid of anything to protect her.

A psychopath’s ruthless serial murders have left the entire nation gripped with fear and chaos. A honest and justice-seeking rookie police officer and a veteran detective with tragic past, face against the killer. After the encounter with the psychopath, their lives totally change.