Looking for a period josei webtoon.

It's been bugging me for days on and off and searching for a similar name/synopsis isn't helping.
The story surrounds the lives of this picture perfect noble family. The child/heir is pretty precocious. The dad thinks his wife is having affair with his younger brother. The mom is momming, I guess. I think the heir wants his parents to stay together and not get a divorce? I have no idea, but that's all I remember, and it occasionally updated with r-19 chapters between the husband and wife. I think the title had "Affairs", "Count", or "Household" something. Please help take this off my mind, I could also be wrong about the plot.