Korean movies can be quite quirky ... but most of all Genre movies can be quite innovative. And what can you more wish for as a film fan than to be surprised and not really know where the movie will go next? What it has in mind and how crazy the characters are - and how fitting they are in the world they are portrayed in. This oozes with creative juices and it really is a fun watch ... well not always as fun for those involved obviously (yes this has violent tendencies and it may offend in certain moments some of the viewers who are easily offended/triggered anyway), but mostly for the viewers.
So go into this with an open mind and just enjoy the mayhem that unfolds ... with the right actors and the right dialog ... and sometimes the silent treatment ... it's not easy being in a criminal world.