I usually appreciate a drama based on one fact: for how long a feeling, a thought or a character is lasting in my had, in my heart, after I've  finished a drama. There are dramas that last one week (the most part), a month, some of them even years. But there are dramas too, that last only a few hours and unfortunately this drama is one of them. I met  again the paradox that I've met before, a drama with amazing cast and with a name that suggests a great action/espionage drama and if you're lucky a great love story. The  disappointment is still hanging in my had. However there are  few things that didn't disappointed me and one is Park Hae Jin. Gorgeous as usual and great acting, he made that this drama worth watching. The action scenes are sometimes boring, but sometimes are really great and also the story. Ok, maybe the old story of the "ghost agents" needs much more for making it unforgetable, but after all and with much help from the cast, it was ok. I loved the bromance but not the romance. It was so flat and I don't think that I met before a main female character with less charm than this one. I've seen Kim Min Jung in many dramas and I simply love her, but even her can't do miracles with a character that has nothing to offer. It seems that it was made in a hurry without giving much of a thought and attention. I'm so sorry for her because she deserved a much complex and well written character for being abble to show  her entire talent. The music just didn't  fit. I don't even remember it. When I like a drama I'm watching over and over for a few days some parts of it. Well, now it's not the case. I hope though that are people who love this drama, I really do, because the cast deserve it.