Irreplaceable monster Interpol Ma Xidao gorgeous return! Seven years after the fugitive was arrested in Vietnam, Ma Sidao (Ma Dong-seok) was promoted to the Seoul wide area search team to form a new police force to investigate a bizarre murder, with a view to catching the criminal as soon as possible. During the investigation of the case, Ma Xidao found a new type of drug crime hidden under the case and decided to expand the scope of the investigation. And Zhu Chengzhe (Li Junhe), the mastermind behind the drug case, unscrupulously expands this series of illegal transactions. At the same time, the head of a Japanese organization specializing in drug circulation, Ricky (Aoki), also came to South Korea to be involved in trading cases, increasing the scale of the crime. In order to arrest the criminals, Ma Xidao will launch a thrilling anti-crime operation with his teammates.