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Detective bureau's tough captain Luo Xun despises his seemingly innocent intern Chi Xia, unaware she is a hidden case-solving genius. Chi Xia infiltrates the bureau to uncover the truth behind her adoptive parents' mysterious deaths ten years ago. As a series of murders occurs, Chi Xia solves baffling cases with her extraordinary talent, shifting Luo Xun from skepticism to trust. The two become life-or-death partners and develop feelings for each other. When all clues point to the masked mastermind 'X', it is revealed that X has planned for a decade to awaken Chi Xia's criminal personality and shape her into his masterpiece, starting a sinister game where the roles of hunter and prey are reversed.