I really wanted to like this series a lot more. It has an interesting premise, a relatable and sympathetic main character, and a relatively good production value.
The good: Generally good acting - at least by the Korean actors. For some reason the non-Korean actors seem to have very little acting ability. A good supporting cast, particularly the feisty NIS agent. Occasionally witty and funny dialogues. Believable actions and reactions of people.
The bad: Shaky camera work. Please stop with this - unless you really know what you're doing, just don't use it. In this case, the shakiness is sloppy and detracts from the action rather than adds to it. I actually ended up having a headache when watching those scenes.
Noteworthy: One of the central characters speaks pretty good Arabic and Spanish, which is keeping in line with their role. Kudos to the series producers for doing this. It might seem like a small detail, but it is a really important one that makes this series believable.
Rating: A solid 7 for now with the hope that the series will improve. I enjoy underdog stories, so naturally I'm rooting for this series to get better.