Within the Chinese imperial court, stern-faced Emperor Xiao Jinyun and spirited Empress Xu Yu are at constant odds with one another. But the universe has an interesting way to solve their issues: an accident causes the two to switch bodies, forcing them to put themselves in the other's shoes—literally. Now responsible for unfamiliar duties and court dynamics, the emperor and empress must navigate the maintenance of their identities, unruly concubines, and the nation itself. In doing so, Xiao Jinyun and Xu Yu's personal qualities and unconventional skills find new purpose, and a sense of understanding and compassion grows between the two.

However, great threats loom within and outside the court. If the imperial astrologer cannot discover the key to switching them back in time, then internal strife and suspicion may lead to the duo's untimely demise.