The drama started out great with an innovative plot, however after the first 6-8 episodes it became quite the usual with cliche like; "a loved one has to die for the other to survive". It was quite frustrating at times as the story was lagging. Hardly any character development. It could be easily shorten to maximum 12 episode drama. I actually kept fast forwarding many episodes. However, I liked Ok Taec-yeon's character and I believe he did justice to his character. I too liked the retro theme brought it. This drama could have been much more interesting if it had a different approach i.e making the vampire human at least half way through the drama. If you are after a light-hearted drama, then it's good to go ahead and invest your time watching this.