The Prince Of The Moon by Megan Derr

All Solae wants is to be accepted and loved by the family that has always rejected him. But given it was his late mother who cursed the kingdom to eternal winter, the chances of that happening are minimal. If he can find a way to break the curse, however, surely that would be enough to change their minds regarding him.

But Solae is forbidden to practice magic because of his mother, which limits his ability to pursue solutions. Desperate for advice and new ideas, he contacts a famous curse breaker—and has no idea what to do when the unexpectedly shows up, handsome and friendly and dangerously intriguing.