Disguised as a palace maid to search for her missing father, Huo Xiangjiu uncovers that the powerful court favorite Feng Mochen is actually a thousand-year-old fox spirit. After an accidental soul swap binds them together, the unlikely pair must solve a string of strange palace cases, gradually uncovering a long-buried secret.

Set around the founding of the PRC, the story follows CCP undercover agent Zheng Chaoyang as he battles KMT operatives. After his cover is blown at the Peiping police station, he escapes with a critical list of KMT spies. Returning to Peiping post-liberation, Chaoyang faces a new challenge—elite KMT spies led by "Phoenix," who is revealed to be his estranged brother, Zheng Chaoshan.

For generations the two cities of Mu Xi and Xuanyue have fought each other, always trying to conquer the other. The old city owner of Mu Xi had only one daughter, Ye Zhaonan, whose gender he secretly concealed so she could one day inherit. From an early age, Zhaonan was always disguised as a boy, until one day when Ye Zhaonan fell off the cliff and met Liu Xuanming, the lord of Xuanyue City, and started a wonderful destiny.

Li Fuzhu, a struggling but clever student, accidentally enters the cartoon world of Yun Lai Country, where she is mistaken for a heavenly savior. Treated as an equal to the powerless Emperor Yun Yi, she tries to help the country prosper but gets caught in a power struggle with the ambitious National Master. Along the way, she discovers the dangers of ignorance and the true value of knowledge.