I Will Raise the Villain Properly

Lucella lost her only blood relative, her sister, and is now raising Lucian, her sister's son, alone. One day, she realizes that this world is inside a book, and that Lucian will grow up to be a villain in the distant future. Moreover, a terrible villain who gets brutally killed after tormenting the protagonist! 'I can't let my lovely nephew die!' To keep her promise to her sister. And to save her beloved nephew. She vows to raise Lucian to be a good child, not a villain. However. "Auntie, I want Auntie to marry the Marquis." He should be growing up well, but instead, he's saying strange things. "Our uncle is not enough as a groom for my sister... but his face is passable." The or...