You guys should know that Nathaniel is aware of the poly relationship that he married into, even in the novel, Nath never actually love the ML, he needed an heir to secure his status in the royal family that's why he's attacking MC. His family is the real villain, his family tried to poison MC to death so Nath's position and status can be secured, they were the ones brainwashing Nathaniel in to thinking he needed an heir to the throne. Nath's family found out that the ML is not born of Royal family's blood(?) I did MTL this and it says that he's a traitor's son or something?? Correct me if I'm wrong.
Anyways the problem here is that Nathaniel blamed it on MC and constantly harassed MC, first with a subtle meaning like a mirror. Look at you guys at Nathaniel's feet worshipping him like he was the most beautiful God you have ever seen, yes Nathaniel is beautiful but his beauty should not be an object to attack mc like that, he gave MC a mirror as a gift which has a meaning that basically said "Look at the mirror you ugly hoe, you're just a side chick"
It's not MC's fault that the ML is such an awful guy and why did he stay in his quarters instead of opening his legs for the ML?? He wanted an heir to secure his status, he should've done his work properly rather than acting like it was MC's fault, he has a part in it, he married into a polygamous relationship, he should act like one