Main plot: A freshman girl travels to Luoyang City in the Tang Dynasty. The imperial physician Da Xiyang's family is killed, and she borrows the fairy clothes given by Wu Zetian to return to modern times. It was six years later that he traveled back to Chang'an again to save people. He followed Da Xiyang's daughter Da Xi Yingying into the palace. During the process, he learned that gathering the "Four Heavenly Craftsmen" (four unique skills of crafts) would allow him to travel back to modern times, so he embarked on the road of searching for the "Four Heavenly Craftsmen" together with the double agent Mu Xingzhi and the Ming Dynasty Jin Yiwei Ji Xingjian.
Auxiliary plot: Da Xi Yingying enters the palace to avenge her father, and gradually becomes an insider placed by Li Longji in Empress Wei's party, and moves towards self-destruction step by step.
Story background: several years before Li Longji ascended the throne. When Empress Wei came to power, she wanted to imitate Wu Zetian and become emperor, but was overthrown by Li Longji and Princess Taiping. Afterwards, Li Longji and Princess Taiping fought, and it ended with Princess Taiping hanging herself and Li Longji sitting on the dragon throne.