Spoiler:
Yes Armand is Duke Kleimore. It was revealed by the butler to the Duke. Armand is one of the many "title names" of him.
Further spoiler: he wont reveal it to her yet to find out what happens in the future.
It may get a lil stupid at times but also has some nice situations and character development
Edit:
And it gets revealed to the Duke at around ch 74
Ohho tyty! I peek at latest ch, the female lead still in the dark about arman so I thought it's still not revealed yet. Imma jump to ch 74 then, tyty~
Can anyone spoiled me which chapter that reveals who arman is?
I'm currently at ch 17 and my interest is degrading fast over this manhwa, but still interested to know who the old guy. I have a hunch that arman is the current husband, but I want to make sure of it lol