I own them all and I absolutely love them. OldBoy was the first Asia Extreme Film I'd ever seen. After that I was hooked and I'm, for the most part, not interested in American horror anymore.
Hollywood needs to stop remaking these kinds of films, they just butcher them to death.
Have you seen any or all of them? What did you think? If you haven't seen them, then you need to do so. You'll absolutely love them. Its better to watch them in their original languages since films are better that way anyhow, also dubs tend to be pretty crappy.
reality is just a dream. i am your nightmare