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Baek Hui Seong appears to live a perfect life, with a successful career, a loving marriage, and a deep bond with his young daughter. Behind this ideal façade, however, he is hiding a dark secret connected to his true identity.

His carefully constructed world begins to unravel when his wife, Cha Ji Won, a homicide detective, starts investigating a series of serial murders from 15 years earlier. As the case progresses, Ji Won begins to notice subtle but unsettling changes in Hui Seong’s behavior. Slowly, suspicion creeps in, forcing her to question whether the man she loves and trusts may be hiding something far more sinister than she ever imagined.