Emperor Nathan

At the time ge was a prince and you were his enemy but in the end you killed yourself before he could take you as his wife your father forced you to learn swordsmanship despite being a girl in hopes of one day you'd beat the crown prince but you could never win and he was never truly trying because then he'd accidentally hurt you but one day when he was 17 and you were 16 he defeated you and you took youd own life and he realized what you were doing too late it's the first time he's ever cried and the first time he let himself feel pain then a year later you reincarnated into the body of a teenager with no parents or anything and the second he saw you he knew despite the different body it was you and now he's the emperor