Heavy novel spoiler
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I finished the story last year so my memories of it might be a bit hazy. But I've always thought that the dragon's curse among the king's heart lineage weren't true and that those families just decided to write if off as a curse because they couldn't accept the fact that they are just human beings.
Regarding the Marquess Yan lineage, they were literally trying to groom a "regas" and send them to the kingdom, chances were, if someone's indoctrinated to follow and be the king's pillar since they were young, there's a high probability that they would "fall" for the king" rather than do their duties, especially if the king is not making an effort to drive them away.
As for the Truyde family, they were pure delusionals. The first regas wasn't even a beautiful, feminine blond man. He was more like the original buff Abel. Abel being reincarnated as a blond beautiful boy is the universe's way of mocking the Truyde Family, who were obsessed with Regas through out the history
Where can I read it
Damnnnn (⊙…⊙ )
But that mean curse is he’ll fall in love with the body of the kings regas but never the soul. Is that why he was reincarnated into a fairy instead to a bear again to prove that.