I discovered this manga today for the first time, I don't regret clicking on it ! It's not every day that I can read such a good story with a world build that is so intresting. 
Haaaa and for the love interest.... I don't like Luka for some reason. And I want to see Yona happy too ! And the red aired one, please, I want him to be in a lovely relationship... (and I want to know more about that fiancé) 
Gosh I want to read mooooore. Ho, and if someone want to talk in pm about that story I'll be happy to do it. Hehe