I love 2003’s Oldboy, the original Korean film directed by Chan-Wook Park. The entire ‘vengeance trilogy’ is a favorite of mine. I own the original film and have seen it multiple times. It always struck me as a very well done mystery with a very, very thick sense of realism. It never seemed Hollywood to me. The action scenes were gritty and realistic (as realistic as a hammer fight in a hallway can be). The characters acted and reacted naturally. It was at times confusing, mysterious, and strange yet it was always compelling. It’s the sort of film that can be viewed multiple times and still be amazing.