To make it short, the show started very well and as a fan of the fantasy genre, the cinematography was really good. The ML did a good job as the cold and bad, and I liked the first six episodes. And then, little by little it gets boring cause nothing is happening, we loose the death part of the ML's character, the plot relies on pratically nothing and I struggled to continue watching, hopefully there was the second couple to root for. And finally in episode 12 and 13, it gets intersting again. And I finally finished it.
The Ost, the potential, the characters, (unless kevin, when koreans use a foreign character it's not well made in general and this is no exception) were incredible to start with, that's why I gave it a 8.5, but it could have been better with a more profound story.