Becoming the Male Lead’s Villainous Sister

Veteran Book Transmigration agent Cen Lingqiu undertakes a final mission before retirement: preventing the female lead's suicide. The female lead, beautiful but frail and disabled, is secluded by the male lead, who views her as a substitute for a lost love. Cen Lingqiu transmigrates into the body of the male lead's villainous older sister, tasked with stopping the female lead's self-destructive tendencies. Despite the female lead's coldness, Cen Lingqiu showers her with kindness. After faking her death, Cen Lingqiu discovers the mission has failed due to the female lead's relapse. Forced to return, she dies accidentally, then again upon a third return. This time, the female lead, now completely mad, is intensely possessive, threatening suicide if Cen Lingqiu leaves. The plot has spiraled out of control. Initially rejecting Cen Lingqiu's kindness and wishing her dead, the female lead experiences a profound loss each time Cen Lingqiu dies. She comes to hate and love Cen Lingqiu most, ultimately begging her to stay.