The Beautiful but Wicked Older Sister in a Period Novel

Jiang Moli wanted nothing to do with transmigrating to the 1970s, but refusing made no difference. She couldn't go back, so she had to find a way to survive here. At least she had transmigrated as a widow, and a wealthy, beautiful one at that. She didn't have to face a strange man right off the bat. But what was the deal with her mother-in-law and brother-in-law? What? What? You want me to marry my brother-in-law? No, no, no! I'm not marrying an idiot! She'd better run and seek refuge with her younger sister, far away from this weird family. They could talk about it once the trouble had died down. Wait! Why had nobody told her she'd transmigrated into a book, as a selfish, independent older sister? Her brother-in-law was the man she'd rejected and pushed onto her sister, and things had ended very badly between them. This was awkward. Fight her sister for a man? Impossible. Absolutely impossible. Was she really the kind of person with no bottom line? Still, her brother-in-law's comrade was pretty great. An unmarried man and an unmarried woman: a perfect match. And he dared to look down on her? Today you treat me like I'm not worth your time; tomorrow you'll be begging for mine.