The story of this drama was good in the beginning. I did find the story slow in the first 3 episodes, but I started liking it in the 4th episode. I started to like the chemistry between Pilhoon and Kyungja, the story, and the roles of the other NIS Agents. But this only lasted up until the 12th episode. The story started to havea lot of filler/draggy scenes, the main leads keep breaking up, Pilhoon keeps saying that he doesn't trust Kyungja anymore but in the end, he still keeps going to her it's annoying and stupid.

I'll just rate in 5/10. In my opinion, this story is better if less draggy scenes and if Pilhoon stops going against on what he says.