Ah Kun (Andy Lau) has monopolized the heroin market for many years, and although he regards Ah Li (Daniel Wu), who has followed for more than 8 years, as his successor, A Kun has always been careful and has never revealed the location of the "warehouse" or the location of the processing plant, nor has he seen other "colleagues". Ah Kun planned to leave his business to Ali, who gradually learned more about the secrets of the drug market. Over the past eight years, A Li collected all the information about drug traffickers as an undercover, but he devoted himself to drug addicts Ah Fen (Zhang Jingchu). The situation of Ah Fen made him feel more confused about his status as a marginal person. In the process of fighting spirit, Ah Li finally won the complete trust of Ah Kun, and the tracking over the past eight years also came to an end.
7.3
