In her previous life, Lin Suisui witnessed the Duke of Yong's household being framed by her elder legitimate sister, Lin Xin'er, and suffering the horrific fate of having the entire family executed. Reborn on the eve of the disaster, she sees through Lin Xin'er's scheme to collude with foreign enemies and fabricate evidence of treason to frame the Lin family. She persuades her family to prepare in advance. Relying on the support of her grandmother, the Crown Prince, and Chancellor Li, she works to rescue her imprisoned father and oppose the emperor, who fears the Lin family's military power. At the same time, she tears away Lin Xin'er's hypocritical facade and carefully plots every move, risking her life to change the predetermined fate of the Duke's household and prevent its destruction.