The story follows an 11-year-old ordinary girl Li Xiaoyu who accidentally finds a magic gem earring in the forbidden city. It then takes her into the monster world hidden in the forbidden city and starts an extraordinary fantasy adventure.

Elementary student Li Xiaoyu was the girl nobody noticed at school. When she accidentally picked up a gem earring at the Forbidden City, it opens up her life to a world where sculptures on eaves would come to life as beasts, immortals, spirits and monsters. As the guardian chosen by the gem, Xiaoyu (Pei Jiaxin) is tasked to help these extraordinary beings solve different problems. She not only makes a lot of mythical friends as a result but also discovers that a young fairy whisperer named Yang Yongle (Han Haolin) is actually the strange transfer student in her class. Together, they embark on a fantasy adventure immersed in traditional culture to find the answer that will save the world of sacred beasts.—ChineseDrama.Info