TL;DR: This isn't a perfect movie. But you can easily overlook the questionable bits thanks to how well made it is. It's a great way to spend a couple of hours. It's what any film should aspire to be - entertaining. Just make sure you don't have a flight booked anytime soon!

The first 2/3s of this movie was great. Fast paced, thrilling and suspenseful action. However the last third of the movie was a bit over the top, with the story going into more of a melodrama territory.

Acting was great all around. Im Siwan especially was really, really good. Kim So Jin and Kim Nam Gil were also great.

The production value was top notch. The cinematography and sound design were really incredible. It really helped make the stakes seem a lot higher. It had that realism that I find lacking from a lot of Western movies (especially nowadays with heavy reliance on CGI). I'm sure CGI was used here too - but it was so seamless.

Overall, a really fun flick and a good theatre experience (I don't think this will have the same impact if you just watch it at home, especially because of the sound). Just go in and switch off your brain (really, don't think too much). You'll have fun!