The problem was it had a lot of similarities to The Untamed and Heaven Official's Blessing.
Which isn't bad. It's just the fact that these types of series always end with so many unanswered questions. Also the last few episodes were really sad. I felt that they didn't get an ending. Other then that it was really good. As for whats similar you'll just have to watch the other series :] I can not express how much I thought the actors suited characters. Anyway you should just watch it. Where do we get in life without chances. Update : I'd Just like to say i keep re-watching this series although its similar i adore it. Its one of my most favorite series. I love the leads and the story. I love the undead. I just love it all.