The former Byung su suicide is diagnosed with Alzheimer’s. The doctor tells him that if the disease was caused by an accident lasting 17 years. The same accident led him to give up the murders and lead a normal life with his daughter. But when a series of murders begin to happen in his town, Byung-su begins to worry, fears that he commits them when he no longer remembers anything. But when he goes over Tae-ju, he is convinced that he is the serial killer and decides to prove to everyone that he is a psychopath.