Silent witness

An occasional murder led to a series of murders that lasted for several years with unique techniques.In an instant, the entire Yungang City was shrouded in a terrifying atmosphere where everyone was in danger.The old detective Liu Baosheng (played by Du Yuan) volunteered to take charge of the investigation. He brought police officer Zhou Ma (played by Lin Xiyue) to consult criminal psychologist Chen Junwei (played by Wang Zhifei) in order to obtain the psychological characteristics of the criminal.In the end, they turned their suspicious eyes to Shi Yin (played by Zu Feng), who was psychologically distorted by the struggle for family interests.During the interrogation, Shi Yin's contradictory confession aroused Liu Baosheng's suspicion. Soon, Shi Yin committed suicide in the prison, and the case fell into a mystery.Liu Baosheng used a trick to conceal the truth and went out to investigate alone, and soon obtained the evidence of the suspect. He was Chen Junwei, who guided the case.Facing the charges, Chen admitted his last crime frankly, and denied all the murders a few years ago.Zhou Ma used his own way to cure him, and he launched a psychological offensive against him using the method taught by Chen...