He is annoyingly persistent like a silly Jendere(sweet, kind, and gentlemanly.) or more commonly called Deredere(a simply kind, affectionate and, above all, an energetic person. They are mentally pure and quite cute, but too afraid or ignorant to understand the feelings of love from others.). It’s just like nothing can ever made his mood negative ! He’s always happy, kind, social and thoughtful no matter what you do ! Maybe to hide a pass he doesn’t want to remember off…? Maybe an abusive family