For those who love action scenes, this is a must watch. The first minutes remind me of the computer game Counter Strike. Oh, I suck at giving reviews but yeah, I enjoyed watching this. Mainly because I love action movies/dramas. The blood and the killings look real so I think someone with a weak stomach shouldn't watch this.

PS. I saw comments saying they don't understand the plot and some scenes don't make any sense but I think you should rewatch it. I clearly understand the story.