Enough 1-word descriptors? If not, read below if you're still on the fence about watching this film.
In a by-gone era of silent films, Ki-duk continues to impress by eking out just the right amount of raw emotion from his actors to keep the viewer immersed in the story. He is notorious for this as he continues to make the kind of films he 'wants' and not just fulfill the wishes of the production companies.
This is far from a masterpiece, yet it is still worth watching. Be prepared for something way different than you're used to. In fact, if you're watching a Ki-Duk movie, then I think you're likely ready for the ride you're about to go on... ;)