四人幫之錢唔夠洗 (1999)

Inspector Lee and his team look into the mysterious disappearance of a seedy loan shark but find no real leads. Amazingly, the culprits fall into their laps. Four young men, led by Wong Wing-Man, confess to the killing. They were deep in debt and found the murder of their friend to be the only way out. There is one problem, though: no physical evidence.