I still can't help feeling bleh about EstellexEmiel, even Estelle's interactions with her brother's friends feel more interesting than this ship. Such a strange direction for the author to take ...
Wow I really hate this second prince now, who cares if he's "a NiCe GuY" after a little time travel. Doesn't change he was a real rotten asshole in the past still.
The only way I can see the ML getting a pass is if the other version of him is from an alternate timeline where he isn't an evil dick.