Synopsis：After Huo Zhongren, the registrar of Muxi City, goes missing in the palace, his daughter, Huo Xiangjiu, infiltrates the palace as a maid to investigate. Amid inexplicable incidents one after another, she discovers that Feng Mochen, a powerful and favored court official, is actually a thousand-year-old fox spirit, and their souls even swap by accident. Are there other spirits stirring trouble, or is it the doing of wicked mortals? With their own agendas, Xiangjiu and Mochen join hands to solve a series of strange cases with a comical flair, while also uncovering an affecting love story, spanning over seven lifetimes, that has been buried for a thousand years.