Ruyi, originally named Dugu Wantang, was the eldest princess of Datang Kingdom. Due to the death of the old emperor, under the pressure of the Southern King's forces, the empress (Lin Xue) was forced to replace the real princess with a fake crown prince (male lead Ye Beichen, son of the Marquis of Zhenbei) in order to protect the Datang Kingdom. The Marquis of Zhenbei and his wife were robbed and killed when they left the palace, and the Marquis of Zhenbei (Ye Chang) was killed on the spot. The whereabouts of the eldest princess and the Marquis of Zhenbei's wife (Xia Shuang) are unknown. The empress assisted Ye Beichen in ascending to the throne as the new emperor and swore to find their daughter and defeat the Southern King after the court stabilized; Sixteen years later, the Southern Prince was exiled to the fiefdom of Jizhou, and the Empress had become the Empress Dowager. Upon learning that the Phoenix patterned Jade Pendant had wandered out of Jizhou, she decided to go alone to search for the Princess Chang and the Lady of the Marquis of Zhenbei, and bring them back to the palace. However, she did not expect that this search for relatives would be disrupted by Jizhou County Magistrate Zhu Dachang, almost causing a rift between Ruyi and the Empress Dowager; In the end, with the wisdom of Ruyi and the help of Ye Beichen, they joined forces to quell internal and external troubles in the court, and Ruyi ascended to the throne as the empress, returning the prosperous era of the Tang Dynasty together