Brief introduction: Li Hucheng, an undercover agent of the "Matryoshka Project", transported a batch of special drug-making raw materials with gangsters. Halfway through, he changed his car at the repair shop of Zhang Hao, who replaced the undercover agent. During the process of changing the car, an accident occurred. Li Chenghu died and Zhang Hao took over. His identity continues to transport raw materials. Unexpectedly, it was intercepted during transportation, and all the people in the car died except Zhang Hao who escaped. Anti-drug police Zhou Xun was ordered by his superiors to intercept and inspect the raw material truck halfway. Li Pusheng, the director, was held accountable by the provincial department. Zhou Xun deeply felt his responsibility and made up his mind to go undercover as a police officer for the drug trafficking organization.
