The Su family of the former general of the country was falsely accused and his entire family was executed. The orphan Su Ningshuang was rescued by a loyal servant. She hid under the pseudonym "A Shuang" for many years. Disguised as an actress, she sneaked into the enemy country Dajing with a poisonous pipa and waited for an opportunity to assassinate the powerful regent Xiao Che, the "executor" of the Su family's extermination.
Her cold and gentle appearance hides a deep hatred, but as she approaches Xiao Che, she falls into a fateful emotional pull. Xiao Che is cold and suspicious. He knows that "A Shuang" has a suspicious identity, but he has an uncontrollable obsession with her. He holds the secret of the Su family's unjust case, but due to the checks and balances of the court and the late emperor's secret, he has been unable to reverse the case. The two people are in opposing positions, and love grows with difficulty in the cracks of hatred. Every approach is accompanied by temptation and precaution, and every tenderness is hidden by the light of swords.
The frame-up of Liu Qingyan, the daughter of the prime minister, and the pressure from Mo Ying, the former secret guard brother, continue to intensify the contradiction between the two. Xiao Che once sent Su Ningshuang to the dungeon due to a misunderstanding and abolished her martial arts skills, which made her feel depressed; but after learning the truth, in order to protect her, he made enemies of the ruling and opposition parties and vowed to rehabilitate the Su family. When the rebellion suddenly breaks out, Su Ningshuang sacrifices her life to block a fatal sword to save Xiao Che. When the oil is exhausted and the lamp is dry, the injustice of the Su family is finally revealed, but she no longer has the chance to stay with her lover.
In the end, Su Ningshuang died in a ten-mile peach blossom forest. After Xiao Che put down the rebellion, he lived alone in the Regent's Palace for the rest of his life, guarding her white jade pipa and relics, and spent his time in regret and longing. Until his gray hair, he still kept the agreement of being buried together with ashes, fulfilling the regretful promise that the two of them would "be an ordinary couple in the next life", leaving only a period of unparalleled sadomasochistic love that spread hatred across the country and the family, and ultimately ended with life and death.
