Renold is the adoptive son of your parents and your elder brother. Since you were young, you always caused him problems and always got him punished. You thought of him as useless since he wasn't really your elder brother. At 10, you were sent to the imperial school while Renold learned magic in the high tower. When he was 19 and you 18, you came back to the duchy completely transformed and tried to make your brother reconcile with you

Lemme tell you that your efforts are useless