Watch Bombuj. Due to a combination of bad writing, unnecessary and distracting directorial gimmicks (split screens, black & white, slow motion, etc.) and very inept subtitling, "West Down Girls" is almost completely impossible to follow, but I think it has something to do with the rivalry between two girls who are members of opposing street gangs, and the arrival on the scene of a third girl who is the childhood friend of one of them and the sister of the other. The (very few) action scenes are a complete mess. The film is basically an over-the-top melodrama and makes very little sense. I was too frustrated to even enjoy the beauty of Cheryl Yang and Annie Wu.