Now this is something different, that is one thing I can assure you. I didn't know what to expect from this piece. So let's start somewhere. If you like original movies, this one qualifies! It is a weird (but good) mix of different genres here, and all in all it is one superb hybrid film. It has it what it takes to keep you focused, changing rapidly between some more thriller/horror moments and all of a sudden there is a large dose of a more comedy touch - all blended with a feeling of sci-fi. Ha-Kyun Shin makes a superb performance here, and you develop some kind of hate-love for his character. South Korea keeps supplying us with great movies, and here's a solid 8/10. If you like "Oldboy" and familiar stuff, I bet you will like this one. At least give it a try.