Shen Jingying, the despised illegitimate daughter of the Shen family, lost her mother to an unjust death. To protect her mother's memorial tablet, she is forced to pretend to be blind in place of her legitimate elder sister, Shen Wanruo, and marry Pei Zhi, the Nine-Thousand-Year Lord, a ruthless and sinister figure who wields immense power at court. On their wedding night, he tests her with the tip of his sword. What follows are one ordeal after another, from bitter herbal soup filled with live worms to humiliation during her return visit to her family. She patiently conceals her true self and carefully plans every move, all to use Pei Zhi's power to take revenge on the Shen family. Pei Zhi has long since seen through her disguise, but quietly protects her and helps her destroy the Shen family and thwart a treasonous conspiracy. When her true identity is finally exposed, he does not blame her. Instead, he grants her unrivaled power and makes her the sole recipient of his affection. Together, they quell a palace coup and bring down the old dynasty.