Triangle (2007)

Small-timer Fei (Louis Koo), his harried buddy Sam (Simon Yam), and antique store owner Mok (Sun Hong Lei) are all in desperate need of money. Fei wants his friend to drive a robbery getaway car but Sam backs out, throwing Fei in trouble with the triads. As the three are arguing, a mysterious man leaves them a map, leading them to an unlikely treasure under the Legislative Council building. All their financial woes seem to be solved after a late-night heist, but they are being tracked by shady cop Wen (Lam Ka-Tung), who is carrying on an affair with Sam's emotionally unstable wife, Ling (Kelly Lin), and has connections with Fei. When the twisted relationship tangles come to light, the brotherhood dangerously breaks down and the treasure ends up in the wrong hands.

Source: TMDb