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A detective is haunted by a past case where he failed to save a victim, leading him to a series of murders orchestrated by a serial killer who communicates through phone calls. As he races against time to stop the killer, he must confront his own demons and the trauma that still plagues him. The film delves into the psychological toll of such crimes on both the investigators and the victims' families.

The film received mixed to positive reviews, with many critics praising its suspenseful atmosphere and strong performances, particularly from the lead actor. However, some found the plot predictable and the pacing inconsistent. It was generally seen as a solid entry in the Korean crime thriller genre.

• Praised for its tense atmosphere and effective suspense.
• Appreciated for the lead actor's compelling portrayal of a tormented detective.
• Criticized by some for an overly familiar plot and occasional pacing issues.

Google audience: Information on specific Google user reviews for this film is not readily available.

The film's director, Jeong-won Cho, also penned the screenplay, aiming to create a psychological thriller that explores the lasting impact of unsolved crimes.