Song Youning is He Linyuan's beloved. To pursue her, He Linyuan confessed nine hundred and ninety-nine times, but before their grand wedding, the two traveled through time to ancient times together. After Song Youning and He Linyuan jointly established the Dayuan Dynasty, she was conferred as Empress. Thinking they could love each other always, He Linyuan fell in love with a female physician outside the palace, and for her spared no effort to break his own promise. He thought Song Youning could not possibly leave him, not knowing that Song Youning had long mastered the method to travel back to modern times, and heartbreak-stricken Song Youning decided to leave by herself.