Marrying a Teacher in the 1980S [Book Transmigration]

Ji Cancan is reborn as the future sister-in-law of the heroine in a novel set in a bygone era. In the original story, she and her husband leech off the heroine endlessly, and in the end they get what they deserve. But now the original character has been reborn into the body of a rich, beautiful woman and is ready to turn her life around. Is Ji Cancan really supposed to fill in the plot as a supporting character and oppose the heroine?! Wouldn't it be better to use her thirty years of foreknowledge to buy a house, wait for the neighborhood to be demolished, and live a lazy life? Ji Cancan quickly packs her bags and escapes the cannon-fodder plot, taking a job as a housekeeper for a young professor who is disabled and withdrawn. Later, Ji Cancan discovers that the professor is the heroine's own older brother, a hidden powerhouse in the original story! Later still, the professor teaches her to read, write, and make money. He becomes her teacher, the kind you marry. Professor: "I sincerely invite you to cling to me, but I prefer it when you put your arms around my waist." Ji Cancan: "...What? My favorite teacher wasn't this shameless!" P.S. The heroine transmigrates into the story. The original male and female leads are not villains. Lighthearted, sweet, and satisfying. Theme: Make your own way and strive for a better life.