Three years ago, Wu Gang was killed by drug cartel K for drug-related crimes, and his son Wu Zhenfeng (played by Chen Xiao) was expelled from the police for reckless violations of discipline. Wu Zhenfeng was disheartened and was stopped from leaving the country by his brother Chen Yu (played by Wang Yibo). On the way, the two were almost hijacked. Wu Zhenfeng was abducted by drug dealers to save Chen Yu and never heard from him again. At this moment, the fate of the two was completely rewritten. Three years later, Chen Yu became an anti-drug policeman, but Wu Zhenfeng returned again and was implicated in the murder case. After Wu Zhenfeng cleared his suspicion, Chen Yu discovered that he had a close connection with the drug cartel. In order to completely annihilate the drug cartel, Chen Yu obeyed the arrangement of the superior department and took off his police uniform to start a new journey of anti-drug career. At the same time, he learned that Wu Zhenfeng was actually a lone hero lurking in the drug cartel. Chen Yu and Wu Zhenfeng successively broke into the drug cartel. The two cooperated tacitly and fought side by side. Finally, under the deployment of the public security, the drug cartel was wiped out. The two brothers continued to devote themselves to the public security anti-drug cause, never forgetting their original intentions and keeping their mission in mind.