This drama is like a puzzle every episode exposes another piece and at the end you have the whole picture. Once yous start watching this drama you want to keep watching another and another episode because you want to know more about the characters and the whole story. All the characters are really interesting and the cast did very good job in portraiting them. The OST/music that this drama has is not much played in the drama but when it is it's really good too. I felt all the emotions from it. I would say it's one of the best kdramas I have ever seen and it's a pity that it's quite underrated, I think that people should know more about this drama. But I have to say that you can't watch this whole series in two days or so because it really effects your psychics and if you watch it in a shirt period of time (like I did the first 11 episodes from 16) you'll be a bit depressed but of course not everybody might feel like that.