Not really a spoiler but just rambling with spoilers so you can understand what kind of story this is and how "realistic" it is. The story explains that in this setting, servant/slave girls belonging to the wife can "sleep" with the husband and enter his harem. Though there's the stigma of "climbing into the masters bed" it is also presented as advantageous to the wife because it gives them a "partner-in-crime" in the harem and the servant retains loyalty to their original master no matter how high they climb.
This becomes a very real issue when MC needs to find a way to solidify his status and comfort as the wife because he needs ML to like him, doesn't know how long his current "comfortable" situation will last and he can "adopt" the child born from their union. He offers his two servants a chance to enter ML's harem but respects their decision when they say no.
I love how mature the author is about this. There's no weird rant about betrayal or whatever. She doesn't condemn the women or ML. It's a cultural practice and everyone understands the pragmatism of it and it's presented so maturely that it feels natural and you can understand that it's even presented as an option. This respect to the culture and customs is refreshing. In many other stories the author chooses to present Ancient Chinese culture and customs and proceeds to bash them in childish and rude ways.
this story is so f**king depressing wow. There’s no happy ending and everyone loses. I’m so sad I just want to dig a hole and bury myself.