IMHO tho

I personally quite liked this arc, as it shows us how Cain will fit in the real society. Despite being a siscon, he is infact still a high spec man, prrtty, gentlemen, especially to ladies, hardworker, can cook, but also not so rigid to be able to be quite casual to even criticize
a prince. He can be friends with many and is blending quite well. And as always he is solving a problem that's not really his problem with his sister's future in consideration. It may seems selfish to some, but it is in fact that what he did also benefit the people he helped, even on the name of his sister's future.

Also loved that they shows how Diana starts to think by herself without forgetting everything that Cain taught her. Because Cain has guided her to emphatize with people, how to solve a problem you encounter, how to pick a choice, and also how to still do what they want while maintaining their roles im society, Diana seems to have a very good future ahead.