Narcotics police officer Lin Feng (Zhang Ziwen) cracked several major drug trafficking cases in succession and pointed the finger at Zhou Hua (Chi Zhiqiang), chairman of Dayun Group, but there was no solid evidence. At the same time, Zhou Hua sent his subordinate Lei Yang (Zuo Jinzhu) to buy a batch of new drugs from foreign drug lord Sunny (Luo Dahua) in an attempt to enter the local market. What Lin Feng never expected was that the other party's new trafficking method actually involved his sister Lin Xueer (Sun Suya)! And his first love Lei Beibei (Cao Han) suddenly returned to China, seemingly inextricably linked to this drug case... In the process of competing with drug dealers, Lin Feng also experienced the dual test of reason and emotion. As the night fades, can the hero usher in the final dawn?