I bet the first prince, ie Dane will be the ML. He doesn't get assassinated in this timeline and Jayna has to fight Angela for him once she sees someone bigger than the second prince.
Pretty sure Maa is going to get accepted, and Amano isn't. So he's going to have to choose her over other girl. Then he's going to find other girl has a boyfriend at Amano's new school. But this won't be for 600 or so chapters.
Can we get over this standard Romcom trash, and make a decision already. New girl is cute though, hopefully they keep up with this level of development. It's finally going somewhere.
He knew what she wanted. And what would change of he had. And that it would only be her thanking for the thing with her son. Which would destroy their relationship. So he chose the platonic sibling relation over the physical one.