In the mythical kingdom where monsters and human beings coexist, Song Tianyin accidentally got pregnant a little demon king who is about to come into the world. In order to protect his son, he escaped all kinds of monsters together with Monster-hunter Huo Xiaolan. Although they gradually developed feelings for this little demon, Xiao Lan understood that she only wanted to sell him for a good price. In a world where humans and monsters coexist, their fate will be undoubtedly touching.