Hello everyone! I'm reading a webcomic and I'd like to read a similar novel. It combines time travel, mystery and thriller. I outlined the summary and it may be a bit too specific, but if you read anything of the sort, please share it! The premise is that there's an empire that's on a verge of collapsing. The aristocrats in it fight for power and use destructive magic weapons. The heroine suspects that the one who supplies the aristocrats with the weapons is the so-called second prince, and that he's also trying to assasinate her. This prince, however, later saves her life and makes a magic vow to protect her. Over the course of events she learns that he’s a time traveler, and the one responsible for all the problems in the empire is not him, but his parallel self from a parallel timeline. The prince basically tries to stop his parallel self, because back in his world he was in love with the heroine and she died because of him... Have you read anything of the sort?