Protégé (2007)

"Akun (played by Andy Lau) has monopolized the heroin market for many years. Although he regards Ali (played by Daniel Wu), who has been following him for more than 8 years as his successor, Akun has always acted cautiously and never revealed the location of the "warehouse" or processing plant. I haven’t met any other “colleagues” either. Akun plans to hand over all the management of his business to Ali, and Ali gradually..."