Seems really many liked this drama and I dont mean to offend anyone, but it was after all another badly written drama by this writer, same as W. Many ideas that fall apart halfway through, the writer creates new rules as the story progresses, ends with many loose ends and plotholes. And that female lead is SOO POORLY WRITTEN. I would rate it 7/10.
I cant believe its already over, I rated it 10/10, one of the best things I've ever seen from Korea. I was a bit disappointed its so short only 6 eps, but I guess it cant be helped as probably one episode cost as much as a full length movie to make. Amazing stuff!