Returning My New Brother [Novel]

Marian just wanted to live a quiet, ordinary life—
but her world suddenly changed.

Because of her mother’s remarriage, she now has a new stepbrother.
The problem is…
He’s way too much to handle!!

“Until the day I die, I won’t let a single drop of water touch your hands.”
“...Why are you the one making that promise?”

“If there’s anything you want, tell me anytime.”
“Then please, stop staying at home and go make some friends outside instead!”

To make matters worse, he even insists on respecting her dislike for standing out—
by spending an absurd amount of money just to downgrade a dazzling carriage into a plain one?!

Is this guy just weird?
Or… are all nobles simply crazy like this?

Marian thought her mother’s remarriage only meant her mom was getting a new husband,
and that it had nothing to do with her.
But now… can she really accept this new family?