I started this very confident about it being a masterpiece. To be honest, I was expecting something different since the first episode, but it came out to be very good anyway. The plot was interesting, he was an alien, she was a famous actress and they were linked by a past 'together'. In the meanwhile an accident to another actress happened, and so we have the main characters involved with a bad guy. So ok, the story is just wow. However I felt like from the 12 ep on it was lacking in something. You have basically two main topics in the drama: the romance and the bad guy interfering with the detectives trying to solve the case and so on, but while the romance is well balanced, sometimes you just feel that the other part of the story is NOT going on. Anyway, it is addicting because in every episode they put something that makes you say "wow, maybe in the next episode something big would happen", or "maybe this thing is related to this and that, we'll see in the next ep.". The problem is, your doubts are not solved. For me that was the only bad thing. Nothing to say about the acting. Everyone was perfect. From Ji Hyun to her fictional brother. In the end I recommend this, it is well done indeed!