I've Got This Cannon Fodder Trope Covered!

Author: 伴树花开
Translator: Me (Xiaobai)
Longer Title: "Favoring the Concubine and Disregarding the Wife? I'll Protect This Cannon Fodder in the Family Rivalry Novel!"
宠妾灭妻？ 这宅斗文炮灰我罩了

Born and raised as the cherished daughter of a marquis's household, Wei Hanzhang had no grand ambitions in life. She only dreamed of marrying her childhood sweetheart and living a happy life together.

Unexpectedly, before they could marry, her childhood sweetheart took two concubines!
Shocked, she then discovered she had transmigrated into a book.
Her mother was the villainous supporting character who lost in the household battles.
Her elder sister was the cannon fodder who was framed and lost her reputation at the beginning.
Her maternal family was a minor character family that was quickly destroyed in the original story.
And she...
She didn't even exist in the original book!
Unacceptable!
How could she be a mere cannon fodder?
Since she was here and had received the grace of life, she had to protect her family.

If her childhood sweetheart was unreliable, the Prince next door seemed quite nice.