Su Nanyan, daughter of the general of Nanyuan, has practiced martial arts since childhood and is the best fighter in Nanyuan. She marries Baili Jingxing, the hostage of Dongque Kingdom in Nanyuan, to monitor and protect him. But on the morning of the second day of her wedding, she suddenly fainted. When she woke up, everything seemed to be strange. Su Nanyan could only have the night time, and her body would be occupied by another person during the day... Fate tied her tightly to a female swindler named Zhao Qingqing. How would Su Nanyan fulfill her mission, and what would be the fate of Zhao Qingqing? Everything started with a "double flower mirror"...