A serial killer, Shin-Hyun, confesses to a series of gruesome murders of female victims, but the killings continue after his imprisonment. Detective Mi Yun and her new partner, Detective Kang, are assigned to the case and struggle to work together due to their vastly different personalities. Despite catching a new suspect, Huh, the murders persist, and the police must re-examine their leads and suspects, including a psychiatrist who was treating Shin-Hyun. The case becomes increasingly complex as the police themselves appear to be suspects, pushing everyone to the limits of human understanding.
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As Shin-Hyun, a notorious serial killer, sits in prison awaiting execution for his heinous crimes against women, a new wave of brutal murders targets female victims, leaving authorities baffled as to how the killings can continue despite the killer's incarceration.
