You should watch this movie over popcorn without thinking much. Expect hyperbolized drama and emotions. Which is typical for Korean dramas. Action sequences are straight from Mad Max: Road of Fury. Also I saw something looking like Purge, Battle Royale and Zombieland. Which is not bad, but nothing new. Also don't take seriously driving. It's not logical or real. It was made just for the sake of action.
Anyway nice popcorn "americanized" movie.