I totally agree with Vinh P, that you can't live up to the standards of an original masterpiece. I randomly saw Oldboy on the On Demand section of Comcast's menu a couple months ago. I ended up watching it since it sounded good and I heard about it a little before somewhere. Wow, was I glad I watched it! haha. It is one of the best movies I've ever seen. And it's very intense and moving in so many ways. It's disturbing in parts too, but overall it's one amazing movie.
So I'm willing to believe the remake of this (if it even ends up being made), would be OK at least. But there is no way it would be as good as the original. The version I watched was in Korean with subtitles, which seemed to make it better actually, and it sounds like a lot of people recommend this version over the English dubbed version. And I read online just today how Will Smith would be playing the main character who is imprisoned for 15 years, then let out and ends up seeking revenge. I feel that Oldboy taking place in Asia and having Asian actors is part of what made it good, and what it is. I'm not saying it couldn't be any good with American actors or taking place in America for that matter. But again, I agree with the person above me who answered, and you can't top something that's already amazing. I think with certain movies, even if the original is really good, the remake can be good. I feel this way about the original Texas Chainsaw Massacre and the remake. Even though the original is the best. But with a movie like Oldboy, it's best to leave it alone and not try to remake it.