Thousands of years ago, Xuan Qinghe, a daughter of the snake tribe, fell in love with the human emperor in the play while traveling around the world. She broke into the palace at night despite the obstruction of her friends just to catch a glimpse of the most beautiful man in the world. Unexpectedly, the emperor of the human world was actually transformed by a great god who came to earth and experienced tribulations. When he was dying, he was dumped by the moody emperor to the demon king Xuan Jing, who was also a "lower race".
This time she fell into a trap, and she was trapped in a thousand years of grudges. From then on, her fate was closely linked to that man named Xuan Jing. He is her inner demon, and she is his doom...