What happens when a struggling novelist meets an adorable little princess who has fallen out of the Tang Dynasty? His life takes an unexpected turn! Princess Li Mingda arrives carrying an ancestral memorial tablet bestowed upon her by her imperial father, Li Shimin, turning the life of Jiang Nan, a modern young man with social anxiety, completely upside down. Determined to prevent the tragic early deaths of the little princess and the empress recorded in history, Jiang Nan uses his last-resort stash of modern knowledge to pass off a flashlight as a magical treasure and sell it to the emperor, while the crown prince becomes inseparable from an electric tricycle. Then a memorial tablet bearing the words 'Shrine of the Immortal Jiang Nan' is appraised by a neighbor at several hundred thousand yuan. Jiang Nan can only laugh and cry: 'I treat you like my little sister, but you treat me like an immortal?' Watch the whole Tang imperial family turn the modern world into a beginner's village in a hilarious and heartwarming reverse time-travel adventure.