In the TX special training base, special police officer Han (Qin Junjie) was heartbroken when he learned that his girlfriend Luo Fei had died while performing an undercover mission. Under the persuasion of Han Chudong (Li Kunlin), director of the Narcotics Control Department, he decided to take over Luo Fei's unfinished mission and go deep into the southern city of Canglan to gain the trust of the largest local drug dealer Gu Tao (Xue Haowen). At the same time, the appearance of arms dealer Jin Lanlan (Sun Yi) made the case more confusing. After experiencing various dangers, Fang Han finally understood the truth about Luo Fei's sacrifice, and successfully contacted the core of the drug trafficking organization, destroying the arms and drug trafficking organization in one fell swoop.