Well I can't really call this an action movie. It's 2 hours long so the pace seemed a little slow. The first 10 minutes were really interesting! Seo ye Ji's role wasn't very well developed Idk but it could be better. However, the cinematography was lit! Very beautiful colouring and luminosity with mesmerizing shots of the night life in seoul. I liked the idea of integrating quantum physics in the scenario but the writer couldn't do it perfectly. I think there is something missing Idk how to describe it maybe some suspense idk... Anyways.. I would give it a 5.5 or a 6 as a global rate, a 7 for the good acting (although I couldn't see a special scene in which the actor could show his true potential) and a legit 9 for directing and cinematography. SHOULD YOU WATCH THIS? Yes, if you have a spare time you can have fun watching it.