HELP ME FIND THIS PLEASE

I've been looking for this historical manhwa that I haven't read for so long mainly because it was ongoing but all I can remember about it is that the FL found out her husband was cheating on her sister (I think) and her husband is a blonde man and the ML (I think he's a duke) with black hair and blue eyes (as always lmao) and I don't remember what the FL looks like anymore but I have a feeling she shares the same looks as the ML or not but I just want help in finding this and maybe I can remember it by looking at the cover because all I know is that in the cover the FL and ML were hugging which is like most of every manhwa, I know T~T