The Seventies Cannon Fodder Awakens and Fights for Everything

(The rating has just been posted and will rise over time.) [Reincarnated in the womb + Period setting + snatching the golden finger + powerful golden finger] Liu Yanyan spent more than a decade in the womb before bumping her head and suddenly awakening. She realizes that her stepsister will be the heroine of a sweet romance set in a bygone era, while she herself is destined to be the wicked stepsister who fights her sister for a man and frames her at every turn. Scenes from the novel keep flashing through her mind. Wherever she goes, she's just a stepping stone for the protagonist. If that's how it is, then she'll snatch the golden finger first and stay one step ahead of them for the rest of her life.