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A mysterious jade pendant begins the journey of Princess Li Mingda (Xiao Sizi) of Jinyang in the Tang Dynasty that spans thousands of years. The beloved daughter of Li Shimin and Empress Changsun unexpectedly broke into the home of modern young man Jiangnan, and instantly captured people's hearts with her cute voice and innocent temperament. Jiang Nan transformed into a baby-loving master, using modern goodies such as candies, cakes, and cars to let the little princess experience an unprecedented novel life; Xiao Sizi traveled through time and space with modern snacks and objects, and brought "fairies" such as flashlights and solar products back to the Tang Dynasty, which opened the eyes of Li Shimin, Queen Changsun, and Princess Changle. A wonderful interaction between two-way travel.