I really liked the fantasy beginning of this drama, but at certain point the main story almost stopped to develop and it got really boring for me. The secondary story was much more captivating and the chemistry between the three SL is much higher. I also loved the little brother, even if his character is useless, if you take it away it doesn't change anything.
It was hard for me to get to the end, I thought about leaving it halfway through. I didn't because of the cast. The actors play their roles really well. Except for Seo In Guk. He was the reason I couldn't wait for this drama to start. Maybe because I had high expectations, he is the one who disappointed me the most. I found his Doom to be mono-expressive and unattractive.