As much as this film BLEW MY MIND it also broke my heart.

But the relentless action made it such an edge-of-your-seat thriller there's no way you're quitting in the middle. I mean the action was so well choreographed, it almost feels musical, and the cinematography, the superb acting by the entire cast brings it on a higher level of any gripping thriller.

And the characters and their stories and the way they all band together setting aside their differences to live and die for one another... that's some next level shit.

At the core this is a story about the weak struggling to survive against the strong, but not just any kind of strong-- these 'strong' antagonistic forces are mindless, strong only because they stopped caring for the weak, animalistic 'zombies' and these creatures draw heavy parallels with corporation financed 'monsters' since not only is our protagonist a hedge fund manager, and the definition of corporate financed 'bloodsucker' as Ma Dong seok even calls Gong Yoo's character who started out being very self serving.

But the symbolism aside, this film works brilliantly as just a thriller even if that's your thing.

As for the gore, graphics, everything like I said everything is done phenomenonally well.