I'm always surprised that other people are surprised that South Korea is capable of delivering good action movies. The action scenes/stunts from this movie alone put some American movies to shame! There is almost an insanity to some of them, but it comes across as really well executed (no pun intended).
Having said that, what I also like about movies from Korea, is their ability to make you invest into characters, while simultaneously keeping them mysterious or at least in grey areas as well. What is good and who is bad, could be a question, but what would be the answer? If you'd be able to answer that of course. Not all movies work with that formula, but this particular one does. You might have to wrap your head around this, so it might take a few minutes to get who is who and doing what, but once you are there (without the movie patronizing you), you will be able to really enjoy this
Having said that, what I also like about movies from Korea, is their ability to make you invest into characters, while simultaneously keeping them mysterious or at least in grey areas as well. What is good and who is bad, could be a question, but what would be the answer? If you'd be able to answer that of course. Not all movies work with that formula, but this particular one does. You might have to wrap your head around this, so it might take a few minutes to get who is who and doing what, but once you are there (without the movie patronizing you), you will be able to really enjoy this