Modern failing web novel author Jiang Chen lives alone in his bridal home in the city. One day, upon waking up, a three-year-old little princess from the Zhenguan period of the Great Tang, Li Youning (Tuantuan, Princess Zhaoyang), appears out of thin air in his home. Relying on a pair of mysterious jade pendants, the little princess accidentally travels through time to the modern world over a thousand years later. At first, Jiang Chen is scared out of his wits by the suddenly appearing ancient little milk baby. After communication, he figures out that the little girl is the legitimate daughter of Emperor Taizong of Tang, Li Jingheng, and Empress Wende, Zhangsun Wan. The two paired jade pendants are the medium of time travel: one is on the little princess, and the other is an old item Jiang Chen picked up on the roadside, which is precisely what caused the jade pendant time travel.