Let’s Raise the Villain Properly

Lucella, who lost her only sibling, her sister, was now raising her sister’s son, Lucian, on her own.
One day, she realizes that this world was actually inside a book, and Lucian was destined to become a villain in the future. Worse, he will be a terrible villain who torments the protagonist and gets brutally killed!
“I can’t let my precious nephew die!”
To keep her promise to her sister and to save the nephew she loves, she decides to raise Lucian to be a good person instead of a villain.
But then…
“Auntie, I want you to marry the Marquis.”
As if raising him properly wasn’t hard enough, now he’s saying weird things!
“My uncle might not be the best husband material, but… at least he looks decent.”
Even the original story’s heroine was seriously trying to set up a matchmaking meeting.
“I agree with that opinion.”
And her uncle just nods along like it makes sense.
“Sorry, but I won’t think about marriage until I raise Lucian properly.”
“So, you mean… as long as Lucian is raised well, it’s okay?”
“Th-That’s not what I—”
“I understand.”
Why is everyone looking so excited?!