Sun Qingxin, a sophomore who jumped off a building due to a hot head, was summoned to the Tang Dynasty by the leader of the Human Dragon clan, and inexplicably became Beitang Meng, the fourth princess of the Human Dragon clan. In order to fulfill her sacred mission - to protect the peace of the world, she married into the Demon Palace as if by God's will and became the Demon Queen of Demon Emperor Ouyang Han. See how the funny time-traveling girl outsmarts the ancient demon emperor, and see how a sincere heart awakens a love that has been sleeping for thousands of years, and melts another frozen heart...