
He's jealous of the affection she had for the brother he killed. It's the first time he saw anyone portray that kind of emotion, and he wants to be a recipient too. He's desperate for it, but he doesn't know how to go about forming a normal relationship of any kind because his family is comprised of psychopaths. He's pushing for her attention the only way he knows how.

This is about poor Lizzie getting another chance to be happy. Too many of you are stuck on the Emperor not receiving any kind of punishment for his prior neglect when He has to be the one to instigate the changes. We already saw what the adults in their previous lives allowed. Leon has to be the driving force in changing the future. Not his future, but hers. This isn't about him, it's about her. That's why his wish wouldn't be granted originally, but he was allowed the opportunity to try to save her from such a wretched fate
Between Rudigar and Dion from "Way to Protect the Female Leads Older Brother"...got me like (whistles softly)
what's wrong with me...why do i feel like this?