Hyped up but I was let down at some points.

The story is overused. I understand that they tried to put a twist in it to make it seem interesting. That's is where it goes wrong, a 'simple' story would have been nice here, because nothing is better than a good written story without too many twists and turns about a guy finding his identity.
I also see that in seeming more Korean movies they used American or white actors speaking mostly English. Stop please, you guys have given us great classic movies without those nonsense.
I must say I do applaud them for taking an insanity amount of one shots. That requires great planning, timing and also needs to be flawless. I loveeeee one shots, but also.. This movie took it too far. Extremely shakey camerawork, too many angles in one shot and at times also budget CGI.

Overall I wanted to love this movie, the effort and work. But it was in all aspects too much.
Too much one shots, too much wanting a complex storyline and too much of wanting American influences.

Watch this if you want gory, action packed movie with loads of one shots.
Skip this if you looking for quality (sorry).