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Two people have landed in the life of forensic psychologist Seon-gyeong: a world-famous serial killer, Lee Byeong-do, who had remained silent until then, and the apparently harmless eleven-year-old daughter from her husband's previous marriage. Since the mysterious death of her mother, the girl lived with her grandparents, but they have just died in an inexplicable fire. Seon-gyeong has set out to make the girl feel at home, however, she has a hard time getting it: she hardly speaks and acts strangely. In fact, her behavior reminds her, in part, of Lee Byeong-do. They both look extremely upset and certainly want something from her, but what? Seon-gyeong will have to find out who is the possible victim in this whole matter before it is too late.