Kim Byong-gook, a seemingly ordinary family man and section chief, brutally murders his entire family and then vanishes. Detective Jong-hoon is tasked with solving the case, but his colleagues are uncooperative, except for one person - Lee Mi-rae. As the investigation unfolds, Jong-hoon becomes suspicious of Mi-rae's motives and discovers that Byong-gook has been hiding in the very building where he works. The workers, unaware of the horror that lurks among them, are soon to find out the terrifying truth.
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A team of investigators in Seoul delves into a gruesome case involving a sales manager's brutal murder of his own family, uncovering a tangled web of desperation and hopelessness.
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