It was Jiangge who killed Liang Yi, the owner and doctor of plastic surgery hospital. Liang Yi, the owner and doctor of the plastic surgery hospital, died on the fifth floor of the plastic surgery hospital. This report was made by his secretary. According to the Secretary, the first to fourth floors of this building are plastic surgery hospitals, and the fifth floor is Liang Yi's private space. There is only one elevator in the building, and no one has the right to take the elevator to the fifth floor except himself and Liang Yi. According to the autopsy, the forensic doctor estimated the time of Liang Yi's death, and the cause of death was cyanide poisoning.