I Got Engaged To The Blind Duke

“I need money.”
Her family went bankrupt and was completely ruined.
She went to the residence of the blind Duke, the male protagonist in the novel, desperate for money.
“How is life at the Duke’s castle?”
“I am living very comfortably, thanks to the great consideration of His Excellency the Duke.”
“You think it’s nice living here? Then, let’s get engaged.”
Now, what does liking living in the Duke’s residence have to do with getting engaged??
“Congratulations. Now you’ll be able to continue living in a place you like.”
“Could I possibly have the right to refuse, by any chance?”
Marin asked cautiously, with trembling eyes.
I hope I do. Please.