Sam Cool and Yat-Tiu are top hitmen for the triads, until Yat-Tiu seduces a mob boss Ma's woman Ling. After his murder Sam Cool and Yat-tiu go on the run, not just from underworld enemies, but from the cops as well, and they are reduced to low-ranking thugs, addicted and traumatised until an opportunity to settle the old scores arises.