You die from being hit by a truck, then you are reincarnated as a Duke's wife in another world, the previous Duke's wife died then your soul enters the body of the deceased Duke's wife

You try to be a nobleman and imitate from royal films while still in your world, it's been a week since Duke started to be suspicious of you and approached you

"Dear, you've been acting differently this week."

Kalix sits beside you, strokes your hair and smiles