When Jiang Yuan woke up, she discovered she had transmigrated into the angsty novel she'd stayed up all night reading. By an unlucky coincidence, she'd become the older sister of Pei Ruan, a male supporting character with the same name and gender as her. In the early chapters, Jiang Yuan beats and berates Pei Ruan, and once he turns evil later on, she's the first one to bite the dust.
Lying in bed and staring at the broken ceiling, Jiang Yuan decides to draw up a detailed plan for raising a child. All she wants is to make sure her “little brother” doesn't grow up wrong and turn into the terrifying person he is in the original novel.