Just my thoughts! The king is driven mad to ensure to trap them with any means. He wants their power for the kingdom (demons fear spirits) so badly that he has to force them. Spirits and royal family don't mix so force them to.
Spreading rumors is a aggression and add pressure by getting more people on the royal family. Spreading rumors and causing the problem to be bigger one then offer to make it go away "if your daughter just marries my son"-the king
The kiing doesn't really care about that, he is weakwilled, and on Rovel's side, its the crown prince who's a douche
I think I'm thinking too much on this mb but yeah.
So I understand that the royal family wants to keep a hold of the mc's family because they are powerful+have access to the spirits which the royal lineage has been blacklisted from but why would they intentionally sour their relations with them?
Like sending ugly cheating agielle was sort of a way to get a royal to marry into their family but now they're intentionally trying to break off the uncle's marriage with his wife who I admit isn't quite faithful for having thoughts for her brother in law. Wouldn't the mess with the rumors etc. be another sign of aggression against their family?
Like the dad already hates the king at this point..
Is the king just trying to pick a fight with Rovel because of his wife, the queen?
Is the Queen just another lustful mess in this story and the king is just salty his wife getting off at another man lol?