and stop her engagement to Duke. Not even a prince can refuse an engagement ordered by the king, but if they can put an end to her saint powers (that I guess the royal family has been using for generations to brainwash the population into liking them), then there’s no need to stay engaged to her. of course, things are gonna get crazy hectic once everyone learns the truth but it’s not like they can just keep brainwashing People forever
I ...do not think Durkis as a country has been brainwashing its citizenry, much less for generations on end.
The current Saintess, Liz, has magic that is basically "Charm" magic, yes, that influences the emotions and disposition of those around her toward favoring her - but that's not something that sounds like it can be weaponized by the kingdom at large, and there's no explicit indication that the "Legendary Saintess" had the same ability,
nor that she or the Crown used it nefariously to control the population.
On the contrary, she is credited with having lifted the nation up and its people out of poverty, establishing it as a powerhouse on the geopolitical stage. She was beloved--yes, that
could maybe be some sort of similar "Charm" magic at play, but she wasn't a net evil on the nation, and there's no indication that she was outright brainwashing the populace.
Also, there's no clear information on whether the Saintess is constantly reincarnated every generation or so; we only know of two thus far (the "Legendary Saintess, and Liz), so even
if both of them were controlling masses of people, it's not something Durkis itself could do top to bottom for the entire time it's been a nation state.
Liz, for her part, isn't exactly doing it on purpose, either. She wasn't aware of it at all, other than having suspicions that
something was up, but she's clearly being portrayed as a kind and compassionate person who truly believes in the concept of pacifism and reconciliation and general "we can all get along and work together to bettering everything" approach.
Prince Duke doesn't want to marry her, but that's because he's in love with Alicia, not because he thinks Liz is some abject evil entity that'll destroy his nation. Even the King wishes he didn't have to force his son into this situation, but because he's a believer in Traditionalism, he sees it as the Crown's duty to make the Saintess a Queen, which would help consolidate magical power at the helm of Durkis and maintain the status quo of nobility and royalty having potent magical aptitude.
And he's not
wrong, except that Duke has ideas of reform for Durkis because he thinks the way forward can't be traversed by looking backward--just like his uncle, William. And now he's going to try and get Liz's help toward that general end.