Might be a spoiler
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Is the king and the white haird boy related? Since they have the same earring
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they are father and son
Rykell and his comrade hid bellerophon's existence from the emperor, who put a corrupted ancient beast inside the unborn prince. Phon's mother escaped the palace and got help from Maybelle's mother.
Phon's mother died not long after she gave birth (she was tortured and experimented by that trash man), but Phon was safe under Rykell's protection. The boy grew up with a massive grudge and Rykell had a hard time coaxing him to let go and focus on mastering his ability. Phon hates the world and despises his talent, so Rykell taught him high-level magic and let Duchess Kyle taught the kid swordsmanship to compensate the gap (it's implied that Rykell felt a little disappointed at his student, but he understood the reasoning).
Phon later shifted his life goal from revenge to protecting Maybelle, because he chooses her as his master. Phon will master his true ability later (after Maybelle modified the "rein" and purify most of the corruption from the beast's mana, liberating Phon from the painful chain).
I read the novel. all of the detail I mentioned will be explained in season 2 and expanded in season 3.
https://forum.novelupdates.com/threads/the-magician%E2%80%99s-daughter.93849/page-2
I put my spoilers here











You guys should stop assuming shit
they probably just want to protect her
they won’t developing romantic feelings for her now
They just like her as a friend/sister until she gets older of course