The Blood Rules (2000)

Perpetrators Mike (Michael Wong), Jean (Suki Kwan Sau), Q (Jackie Lui Chung-yin), and Shoot (Lam Suet) make off with a briefcase full of diamonds, which they turn over to their boss, Uncle Lam (played by Wong Jing's father, Wong Tin-lam). He assures them that their next assignment will be a piece of cake: steal a valuable pearl Buddha bracelet from Taiwanese triad Chicken Sam (Yang Hsiang), who owes millions in gambling debts and is wanted by both his fellow gangsters and the law. Desperate to impress his girlfriend (Crystal Tin), who only cares about money, Q's spendthrift ways are endangering everyone's safety and Jean is falling deeply in love with Michael (who has a wife and son and seeks to maintain the facade of a happy marriage). Shoot, meanwhile, is in love with Jean, further compromising the team's ability to function as professionals. The Chicken Sam job goes awry, prompting a beleaguered Uncle Lam to sell Michael and company out, resulting in a bloodbath. The surviving assassins then set their sights on Lam, whose betrayal is a violation of the most basic rule in the underworld code.