It is of no use. It is the chair of Du Cheng, the criminal police captain of Beijiang Branch. He is a young and veteran policeman who is unsmiling and takes cases seriously and responsibly. Du Cheng was recently investigating a case involving the corpse of a man with a duffel bag. In order to make Director Zhang believe his inference, he even immersed himself in the bathtub for an experiment. Police officer Jiang Feng went to Du Cheng to report that the police station received a report.