In the quadripartite drug market in Hong Kong, Dizang (Louis Koo) gradually expands his power across the border, meanwhile a chain of dog-eat-dog events shock and bring the whole trade on high alert. Tin (Andy Lau), now a financial tycoon, offers a bounty to eliminate the No.1 drug dealer. A final battle has broken out between the two tycoons which were once lesser-known brothers from the same triad.