The story is quite simple with no twist and turns. U can predict the story but, if u love full on action then its your cup of tea. Some of the scenes are quite brutal but, i love it wholeheartedly. Visual effects and quality are top notch. BGM is good. Acting wise all done a amazing job. Ma Dong Seok action is no dojbt outstanding. Lee Jun young performance is amazing and his bromance and acfion with Ma Dong seok is perfect. Roh Jeong eul done a good job in her role. The antagonist Lee Hee Joon done a crazy job in the mad scientist role. Ahn ji Hye done a quite a action with Dong seok and jun young which was great. Kudos to all the supporting artist who done a fabulous job in the movie.
I don't know why the ratings are low but i recommend it you are willing to watch a topnotch bloody badass action movie.