After getting approval from his superiors, the young anti-drug police officer Chen Zheng (played by He Shengming) changed his appearance and went undercover in a drug factory. He cooperated with Jiang Hai (played by Wang Yiquan) outside the factory and planned to uproot the large-scale drug manufacturing and trafficking gang headed by He Yuanhua (played by Yu Entai). During the process, he was repeatedly tempted and threatened by the insidious and cunning drug lords. In order to gain the trust of drug dealers and accurately locate the drug factory, Chen Zheng had to force himself to look like a gangster who had been in the black and gray industries for many years. At the same time, he had to get rid of heavy surveillance and searches to pass on the news. The battle between Chen Zheng and the anti-drug police and the drug trafficking gangs began.