汪行健刚刚从警院毕业却在机缘巧合之下，参加了一起抓捕毒贩的行动。他在这场行动中表现优异，得到了禁毒队队长郑潇的赏识，郑潇力排众议，把汪行健调入了禁毒支队。与此同时危害巨大的新型毒品 C2在临港又出现了。在郑潇的指挥之下，女警张卓颖和汪行健搭档，打入了贩毒团伙中当卧底。他们先后破获了毒贩神秘死亡的案件，大学生吸毒坠楼案件，快递贩毒案件等。最后他们发现C2来自一个大型跨国的贩毒集团。市政委书记陈辅不慎被该集团的首脑郑潇的初恋女友的杜明珍利用了。给郑潇办案制造了阻力，可汪行健依然愿意相信郑潇，最后终于把杜明真绳之以法。这一桩压在郑潇心头10多年的案件也真相大白了，而汪行健和张卓颖也成为了出色的禁毒警察。两人克服了生活和工作中的种种困难，最后在一起了

Wang Xingjian had just graduated from the police academy, but by chance, he participated in an operation to arrest drug dealers. He performed well in this operation and was appreciated by Zheng Xiao, the captain of the anti-drug team. Zheng Xiao tried his best to transfer Wang Xingjian to the anti-drug team. At the same time, C2, a new type of drug with great harm, reappeared in Lingang. Under Zheng Xiao's command, policewoman Zhang Zhuoying and Wang Xingjian teamed up to work as undercover agents in a drug gang. They successively uncovered cases of mysterious death of drug dealers, cases of college students taking drugs and falling from buildings, cases of courier drug trafficking, etc. Finally they found that C2 came from a large multinational drug cartel. Chen Fu, secretary of the Municipal Party Committee, was accidentally used by Du Mingzhen, the first girlfriend of Zheng Xiao, the leader of the group. It created resistance for Zheng Xiao to handle the case, but Wang Xingjian was still willing to trust Zheng Xiao, and finally brought Du Mingzhen to justice. The truth of this case that has weighed on Zheng Xiao's heart for more than 10 years has also come to light, and Wang Xingjian and Zhang Zhuoying have also become excellent anti-drug policemen. The two overcame various difficulties in life and work, and finally got together