Very fun drama, with very good production value. Story is nothing too new, with your typical agent drama and government corruption storylines, but the characters are fun and fairly well fleshed out. Nothing much in the way of silliness, just a good action drama that is up there among the best of them.
Though I'm a bit disappointed to find out that this is a multi-season drama. Part of the reason I watch far more k-drama than American shows is that American shows are too long to keep up with and they never know when to end, until eventually to the point where they end up sucking. Most k-dramas, on the other hand, have a set ending at about 16 or 20 episodes. They are easy to get into and can be very satisfying when the writer knows where they want to end it and knows to do so within that singular season frame. Kind of stinks that the trend is going toward multi-season now. There is also so much uncertainty with multi-season, like the possibility of never finishing if the drama wasn't popular enough (which I know is not the case with this one). Or even if it was popular, we may not see another season for another five years. Looking at you Signal. *sigh*
Yes, this was more of a rant than a review, but felt compelled to. Anyways, great fun drama that is highly recommended if you don't mind waiting who knows how long until it will eventually conclude.