Jiang Zhaohua, the legitimate daughter of a general's household, is publicly rejected by Crown Prince Yuan An. Adhering to the ancestral motto that "the women of the Jiang family shall not be concubines," she instead marries the Third Prince, Yuan Xuan, by imperial decree. Yuan An repents and entangles her only to ruin his own future, while Yuan Xuan ascends the throne as emperor. The transmigrated woman Su Yao uses the name of the "heavenly maiden" to throw the imperial harem into chaos. Jiang Zhaohua and the emperor join hands to expose the conspiracy and purge the old faction. Eventually, they abolish concubine selection, give birth to fraternal twins, and guard each other to pioneer a prosperous era.