Okay so:
1. I think it can’t be helped that Kaya ended up like this growing up in that kind of environment. Not saying it excuses what she did, but I would like to blame the mother and father in all of this. She probably would’ve had a better personality if she grew up in a decent environment. Same with Miyo of course. Miyo could’ve been a happier, normal girl. Although if she did grow up like a normal aristocrat I’m not sure if Danna would still have fallen for her.
2. I don’t really dislike Kouji. Despite everything, he was still nice to MC. He also knows his position well, and is probably aware that he has no real power within his family. I saw it clearly in this chapter when he refused the temptation and reasoned with logic. Well, just saying he’s better than those impulsive, rude, sexual harassing second male leads who’ll force a kiss on mc thinking it would win them over. I’m hoping that by the end, he’ll continue to be logical and won’t do anything to sadden mc(and hopefully not go after her cuz she’s in a happier place with a man who can protect her better.)
Anyways this is just my analysis of these 2 characters.