Beasts That Cling to the Straw

I know this is a sub-genre that some people love and they would split hairs, calling me a killjoy, but to me this is like...Layer Cake? 8 Heads in a Duffle Bag? There are also some South Korean films from about twenty years ago with similar themes, though admittedly the script is original in its character development and fine details. I don't know how people survived all of those head injuries, especially the old grandma. It's a dark comedy, not meant to be realistic, and apparently based upon a novel. The main protagonist any normal person would root for is a clerk at a jjimjilbang, a real working class victim of the system, so I can gladly put this well-written film into the cannon of SK flicks that defend the downtrodden poor.