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An old male corpse cut in half was excavated from Pingyuan Ouchi, which implicated a bizarre self-immolation case of a "six-fingered lame man" more than ten years ago. The female lawyer whose motive for her behavior was a mystery chose to surrender voluntarily and admitted herself as an accessory. The police identified the neurologist Gao Yan as a major suspect. However, in the face of interrogation, the suspect Gao Yan used the information gap to continuously create smoke bombs and compete with the police, completely disrupting the direction of the investigation. When the truth of the case was confusing, it was discovered that the complete body of a man who had been chopped in half was pieced together by multiple people. As the police persisted in their pursuit - twins, half-mothers, adoptive adoption, and reorganized families - four pairs of brothers and sisters with abnormal relationships gradually emerged. Because of the joke of fate and the tragedy of the times, the family ties and fetters imposed on people that cannot be shaken off or broken off gradually make the sisters gradually break out in their tolerance and prejudice, and they actively or passively wield tangible or invisible "butcher's knives" against their brothers. The combination of an anxious detective + a redemptive lawyer, a surly female doctor + a young man in trouble, as well as a crazy superior, an infatuated lover of the white lotus, an innocent gangster, a straight man, and a shady family doctor have staged an offensive and defensive battle that has been misaligned for more than ten years.