Hi! I am looking for novel. I don't really remember a lot but what I can recall... MC was some kind of assassin (he used daggers I think) who was either reincarnated in another world (or not) and studied/enrolled in some academy, where people could ride dragons. He also tamed a dragon by defeating him. One thing I do remember is that he was one of those rare guys in the story who could fly standing on the dragon. There was also a fight between academies or something. And MC happened to be some prince or whatever in the kingdom. There was also some ancient conflict involved. P.S. Also for some reason I feel like I did not like the ending...