Ordinary office worker Wang Cuihua accidentally enters the fictional world of a novel, becoming its secondary character Yu Wanyin. Discovering that the story's male protagonist Xia Houdan is also a transmigrator from modern times, the two join forces to confront palace conspiracies and border wars, rewriting the story's tragic trajectory. Through her cunning political strategies, Yu Wanyin helps Xia Houdan dismantle systemic corruption. Ultimately resolving both national crises and emotional entanglements, they return to the real world where their hard-won partnership blossoms into an empowering new chapter of life.