Cannon Fodder Female Supporting Character Returns To The 1990s

Lu Mingfang was originally the daughter of Lu Hongyuan, a worker of the Lu family in the city. After she was born, she was moved to the countryside because her grandmother was partial to her sister-in-law's illegitimate daughter. The sister-in-law's daughter went to the city to live a good life instead.
It wasn't until her cousin's biological father, a wealthy businessman, came back to recognize her relatives that Grandma Lu was forced to tell the truth, but she blamed everything on Lu Mingfang's mother. As a result, Lu Mingfang and her mother were kicked out. Not long after, Lu Mingfang fell seriously ill, and her soul traveled to the world of immortality. She had a dream for five hundred years and came back again, back to the 1990s when her life experience had not been revealed. When she came back again, she realized that she was just a stepping stone to fulfill her destiny as the daughter of her cousin.
In order to change her destiny, she decided to change her destiny against nature.
Wait a minute, why is there still a cannon fodder who almost killed the protagonist? And in the end it became the biggest stepping stone for the protagonist.
Lu Mingfang: Stay away from me. Falling in love is blocking my path!
A certain villain: I am willing to be a stepping stone for you!