Five hundred years ago, the demon monkey Sun Wukong made a riot in the Heavenly Palace and accidentally kicked over the Eight Diagrams Furnace, causing the sky fire to fall. Princess Iron Fan tried her best to suppress the sky fire in order to save the people, but the Red Boy in her belly was eroded by the Samadhi True Fire of the Eight Diagrams Furnace and became a demon child. At the Iron Fan Millennium Birthday Banquet, Red Boy had been looking for treasures in the world for his mother. Hearing that the pilgrim team had passed by, he was instigated by the Canglang Monster to rob Tang Monk. Just as Red Boy and Sun Wukong were fighting, the Canglang Monster designed to trap the two in the Eight Diagrams Furnace. It turned out that the Canglang Monster's family died in the sky fire when he was young, so he took the opportunity to avenge Sun Wukong. Unexpectedly, the Canglang Monster's conspiracy caused the people of Huoyun Village to encounter a mountain fire again and fall into danger. Red Boy became a demon and turned into a flame giant. Princess Iron Fan told the truth and used her last magic power to save the people. She took out a drop of nectar given by the Bodhisattva. At this time, Sun Wukong suddenly realized the Dharma, understood the cause and effect of karma, and the source of everything was in himself. He decided to sacrifice himself and walked towards the flame giant with the nectar.