During an operation against armed robbers, the hostage Li Xiang was accidentally injured by sniper Zhang Yuan and observer Hu Bing of the SWAT Brigade. In order to take better care of the injured and paralyzed Li Xiang, Zhang Yuan left the SWAT Brigade and equipped Li Xiang with a brain-controlled drone with the help of his girlfriend Su Qiu. He and Li Xiang became a tacit partner in cooperation. Three years later, in a news investigation, clues led Zhang Yuan to a factory. Unexpectedly, a drug-making workshop for producing the drug raw material ephedrine was hidden in the factory, and former teammate Hu Bing became the person in charge of the factory. Zhang Yuan sneaked into the factory to investigate, but happened to run into another group of drug dealers Liu Qiang who came to rob the goods and was forced to be involved in this fierce drug war. In the end, Hu Bing's undercover identity was revealed, and the former special warfare elites who lived and died together once again cooperated tacitly, and with the help of Li Xiang's drone in the sky, they successfully cracked down on drug dealers and guarded social security.