The young Chu Mu was ambushed and implanted with the White Nightmare Demon by Xia Guanghan, who then abducted him to the Green Nightmare Demon Island. Under the control of the Nightmare Palace, Chu Mu and his soul pet Mo Xie were forced to fight fiercely for their survival. Ultimately, Chu Mu became the youngest king of the prison island and gained fame after a battle in front of the princess, earning the title of Nightmare Youngster of the Henghai. With some newfound freedom, Chu Mu immediately returned to Gongluo City to save his family from danger. Meanwhile, Mo Xie's talents attracted the covetous eyes of Xia Guanghan. Chu Mu fought again, and after a narrow victory, he was rescued by his mother whom he had not seen for many years...