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.