After I Transmigrated into a Book in the 1970s, the Cannon Fodder Went on a Rampage

No CP. Also, the protagonist's name is Jiang Yu. There were a few typos, and I can't change them for now.

She transmigrated into a book, only to find herself as cannon fodder who gives the male and female leads their golden fingers?

She takes on her scumbag father and his illegitimate son, learning the true meaning of being human.

She snatches the heroine's opportunities and the hero's wealth. Bring it all into Sister Yu's arms!