Unforgivable
No Mercy Only Malice
A brutal murder points to a suspect who died 10 years ago. Detective Dong-geun finds a torn diary page with a past date at a crime scene. It belonged to Yeong-hoon, a soldier who died by suicide. As more victims emerge, Dong-geun uncovers ties to hazing, corporate secrets, and forgotten memories of a lost friend—pulling him deeper into a chilling mystery.