Psychopath Diary

Dong-sik gets fired from his company and witnesses an incident that changes his life.

Dong-sik's attitude completely changes, and In-woo and officer Bo-kyung look for a homeless man.

Dong-sik secretly plans his next murder, and Bo-kyung receives a suspicious report.

Dong-sik gets promoted to Deputy thanks to In-woo but finds his suicide note.

Bo-kyung discovers a pattern in the serial murders, and In-woo makes a move.

Dong-sik is conflicted after learning the truth about a case, and In-woo approaches Bo-kyung.

A case similar to the Predator serial murders emerges, and an anonymous call comes in.

Dong-sik’s life is in danger, and In-woo figures out Dong-sik's real identity.

Dong-sik and Bo-kyung discover the truth about a past incident, and In-woo tries to frame Dong-sik.

Dong-sik gets caught in In-woo’s trap, and Bo-kyung finds a lifeless body.

Dong-sik is filled with guilt and tries to leave, but the diary falls into In-woo's hands.

Bo-kyung confirms her speculation, and Dong-sik meets the perpetrator of a past case.

Bo-kyung uncovers the truth about a case and is put in danger by In-woo.

As Dong-sik regains his memories, he learns who the actual culprit is and plans his revenge.

Dong-sik starts a mission to find conclusive evidence, and Bo-kyung summons In-woo.

The showdown between Dong-sik and In-woo comes to a head.