I admit myself that it was Kim Woo Bin that made me want to watch this.
He and Kim Sung Kyun gives a wonderful synergy through the story.
Imho, it ends here. All the good bits.
The entire movie there were several things I just couldnt get my head around:

1. So.. anyone can become an officer and authority if they have the martial art skill?
2. Low level drones giving Ace quality nightvision (facepalm).
3. Ankle devices being able to be cut with scissors....
4. Regardless where they were, what dire situation they were in, they never ever called for police backup nor did they seem to work with the police force,,,
5.Bodywest that does not cover the entire torso...

Tbh, my list can go on. Normally I can ignore those details, but for me this time, it destroyed the story, as these details were the story. It feels they just wanted to showcase KWB's athletic skills but even that was kinda poorly executed.

When the end came I just felt utterly disappointed, what a waste of time.
The only reason it doesnt get a 0 in rating is because the acting of the actors was really good. It felt they did the best of the situation...