The demon king pretended to be a mortal and fell in love with the little Taoist priest. After his identity was revealed, the little Taoist priest returned to the west. He was heartbroken and failed to escape the tribulation. After years of vicissitudes of life, he became a little demon and was kept in a bottle by the demon catcher. Only then did he discover that the demon catcher's grandson Shen He was the little Taoist priest back then, so he followed him to start a new round of ghost hunting.