Transmigrated into the Cannon-Fodder Little Girl in a Period Novel

An original story: period setting, special space, transmigration, one-on-one romance, and a lighthearted, funny, healing sweet romance. She transmigrates into the body of a fool, and to make matters worse, it's an era when people can't keep warm or get enough to eat. Life is tough, and even a fool has to sigh! Looking at her frail, pretty-boy father, then at her timid, erratic mother, maybe they can still be saved? And then there's her sister showing off her tea-serving skills, her brother who's a master of psychological manipulation, and herself, who's known as a fool. What a family of complete oddballs! Then she remembers how short-lived they're all destined to be, and she wants to cry. By a twist of fate, she receives a golden finger from the female lead. So she starts making plans on the sly and prepares to turn her life around. Just as she's about to wave her hand and boldly tell her parents, brother, and sister, “Go ahead and do whatever you like. I can still afford to support you, and I wouldn't mind taking care of one more,” she discovers that they're all such formidable fighters that she somehow ends up winning by following along behind them...