Yuan Wan'er sneaked into the Tang Dynasty New Oriental Academy to search for the heavenly book that contained a secret, and met Sima Qingyang unexpectedly. In the misunderstandings and cooperation, Yuan Wan'er's kindness and intelligence gradually moved Sima, and the two secretly fell in love. As they continued to search in depth, the two worked together to unlock the secret of the heavenly book and harvested their destined love.