
From what I read in spoiler, because the sister is so distraught that Wis is being sacrificed because of her, and her family basically unconsciously choose that, she felt really guilty is ruin her memory and her mental health.
So, that bastard ban her name to be spoken at the house.
And the whole country and her family didn't know the fact that bastard is the one who push her to go.
The mom thought she chose to left because of her slip up.
And the country thought she chose because of her miasma study.
That's why the rumor and the story became worse and worse.
So that bastard is the root of all problem.
That's why I think that even if the son didn't know anything, he still gonna made her suffer.
No way she’s going to end up with the son right???? No fucking way right?????? she’s 43