Hell's messengers descend to Earth disguised as an old man and a masked assassin to rule the world. Upon arriving at Beidou Village, they become obsessed with finding the North Star Sword and the North Star Child, but it's not easy. Meanwhile, in Beidou Village lives Meng Gu, a foolish yet innocent and naive boy, who is constantly teased by the village children. However, the mystical North Star Sword and the North Star Child with seven dots on his body are none other than Meng Gu himself. Finally, a tense tug-of-war begins between Ji Mu Shin, the daughter of the hell messenger, and the Praying Mantis who protects Meng Gu. Meng Gu shouts with courage and magnificently unleashes the power of the North Star Sword.