There are three realms in this world: humans, dragons, and demons. Humans live in the human realm, dragons hide in the dragon realm, and demons live in the underworld. For thousands of years, the three realms have lived in peace and harmony without disturbing each other. Eleven years ago, the devil broke through the barriers and invaded the human world. For a time, all life in the human world was in ruins. At this time, a young man named Wei Zhi received the guidance of the great wizard and went to the depths of a certain eastern cloud to find a dragon to save the world.