It was a good crime, police, investigative andd sci-fi drama. But it was only good for the first half (or the first 7 eps), after that it went south. At first it really intrigues me, im very curious on what will happen. Plusss, I have always namgoong min, and his character that is cold but actually very warm inside. Also, i was rooting for him and gong hye won huhu sad we didn't get a lot of them ;') well anyways, the storyline started very well and interesting, but then it started to become messy... too many storylines that I dont know which is the main and which is the subplots. It also becomes draggy? I swear it started with very fast pace and I loveeeee thattt but then idk maybe it went too fast. This drama is that drama that could be better somehow. the story, the mystery, the revealation is good but it wasn't scripted and executed well. Ahhh, acting is good for me especially namgoong min, well i have always like him. anyways, it's a good drama, not great not amazing. It just an okay for me :))