Dragon King: The Beasts' Code 2002 龍王　獣たちの掟

In that city, Wang, the boss of the Beijing mafia, was at the center of everything. Anyone who defied him was eliminated... And then, a mysterious man named Chang Lo, who was being hunted by the Hong Kong mafia, drifted into town. In order to settle his past, Chang Lo set out to steal the "shaking head drug" that Wang was supposed to handle!