Actually, the captain hate the prince a lot in the novel before he serves/likes him. It just that the manhwa portrayed the captain’s attitude lightly and didn't delve deeper into what was happening before the captain like the prince. They really skipped a lot of scenes of the novel in this manhwa.
so that's why it seem odd how he suddenly wants to serve the prince
Guess I wasn't the only one. They didn't dwelve on it and just said he hates him. And the sudden change was too...quick and weird. I can't come to like him.
In the novel he has a far more complex character the manhwa kinda nerfs it
the holy knight captain... I don't like him like he suddenly liked the prince