Story is quite interesting, full of secrets and politic too. Acting is good. Still watching, will update the review once finished watching this. UPDATE: I like lee joon gi's acting here. Lee Yu Bi is cute, but the acting is okay lah. Not too good and also not too bad, but quite different from the webtoon's character. The story itself is great, and makes sense even though it's a fantasy story. There is no unnecessary misunderstanding, i like how the lead female really trust lead male. However, some parts are not explained here and make u guess it yourself, for eg why Kim Sung-yeol didn't want to fight the vampire king in the beginning and kept trying to find the secret book, well, i guess it because he doesn't drink human's blood so often so he is weak? etc. Even though it has flaws, but i really like the story and lee joon gi really bring Kim Sung-yeol character alive. I don't get bored watching this too even though it has 20 episodes. The ending even though is ambiguous but i am satisfied and i will just view it as a happy ending.