I like where the starting point. The prince was clearly a POS but he didn't really do anything unforgivable (murder, harm to commoners, etc.). Additionally, no one really punished him until he got condemned which shows his father sucks at parenting. Now that he's been beaten down for the first time in his life and begining to see the error of his ways, he has the opportunity to reform himself and seek forgiveness.
We don't even know anything about the second prince and based on the kings poor parenting skills he might even be evil. Maybe Kuru will become a good person and defeat his evil brother? Or not, there's a lot directions this story could take.