The movie is very creative in my point of view; The way that each character portray themselves are very unique, and it's a very good story, but, I do have to point that is very Dark and has a slight plot twist - As well as an open ending, that leaves you with the infamous question: "What in the world just happened?"
I don't think it gets in the way with the fun in watching though, but it would be a warning for those who don't like it.
I think the only think I don't like is the repetitive music, but it does happen a lot even in new dramas, so we can't help it. If you're looking for somehting intense, it is worth watching.