Bai Yueguang, Yu Qingyin of the Immortal Sect, was pierced through the spiritual platform by the demon Taoist monk Cang Jiuyao on their wedding night, and her soul died in the red curtain. After being reborn for hundreds of years through the Broken Heavenly Secret Mirror, she returned to the time when she was a delicate girl, and the demon who killed her was still a humble swordsman who had been humiliated in the sect. She originally wanted to avoid him for the rest of her life, but was forced to enter into a contract marriage with him due to family changes. On the wedding night, he chuckled and strangled her throat: "Sister, do you still want to kill me in this life?" It turned out that he also returned with memories of his previous life. After two lifetimes of love and hate, destiny reflected in the mirror, she realized that the fatal sword was actually meant to save her life.