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She once teased him and asked him to dress up as a girl to participate in the women's 800-meter sports meeting organized by the school. He transferred to another school and left soon after, for which she has always felt guilty. They met again as an adult, but it was at the scene of a murder. At that time, she was already a heroic policewoman, and he was the front man of a private detective agency. The two of them joined forces to solve strange cases repeatedly, and gradually created different sparks; but as a former serial murderer "resurrected", they seemed to be trapped in a lot of fog, step by step into the trap set by the murderer without knowing it...