
Ahhh I think I recall the spoiler as to why?
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The man rose married was a dear friend I think and the woman the Duke later married was threatening to kill him so rose married him instead to protect him.
Also why the Duke doesn't have kid with the lady he married I believe was it was a deal if he married her she wouldn't get kids from him.
It's fuzzy on the details but I think it was roughly along those lines.

Well the duke's wife seems a bit sus especially when iris came infront of the duchy. She somehow didn't want iris and the duke to see each other lmao. And the way she treats iris's cousin is also very suspicious to me like... You can't treat a girl who has red hair and a contact lenses that suddenly appears out of nowhere. Now the most confusing thing is... I know for sure that the duchess recognized that iris was rose's daughter just by lookingbat her for 15 seconds. Idk why the duke did not realized it sooner that it get to the point that he needs the mole in the heel as 'Evidence' that she's his daughter lmao. It's practically obvious just by looking at her hair and eyes. The duke sure is blind
I still don't get why she did not marry him tho ? I mean he is a duke so it should be all good to marry him for her family ????
I can't wait to hear their story cause i really don't get it lmaoooo (especially since they both loved each other so much and even now)