The modern social animal Wang Cuihua traveled through time to a refreshing book-traveling novel "The Devil's Favorite Concubine", and became the villain Yu Wanyin, the evil concubine who was supposed to be defeated by the protagonist in the original plot. In order to protect themselves, she joined hands with the tyrant Xiahou Dan, who was also a time traveler, to survive in the strange world. After many battles of intelligence and force, the two successfully prevented the tragic ending of the country's demise in the book and became wise rulers.