I cannot begin to describe how much I enjoyed this movie. Although the story was slightly confusing at times, the overall feel of it is excellent. It's an original storyline that keeps you on your feet until the very last second of the movie, that was the best part. I won't spoil it for those of you who are considering watching, which I recommend to all those who love suspense and don't mind a bit of gore (this is a horror movie after all). I guarantee you can't guess the answer to the killings until the very end, it blew my mind, I so didn't see it coming. I'd like to commend Lee Ki Woo and Park Ki Woong (especially) for the great acting. PKW played especially well the part of the mysterious boy, it was a gem! Some of the acting could've been better, but overall it was very good. The music isn't very present in the movie, I don't think I even noticed it, I was too absorbed by what was going on, suppose that's a good sign (not for the music though). Although rewatching this will spoil it since you already know the answer, it still worth it to catch all those signs you didn't see before that eventually led to the answer. Overall, I strongly recommend this movie, especially to horror and suspense fanatics, and people who like a good mindf*** (sorry) =D