Легенда о горе Хуаго

The legend of Flower Fruit Mountain has long circulated throughout the Three Realms. It tells of how the Great Sage Equaling Heaven, Sun Wukong, fought the world-destroying demon, the Six-Eared Macaque, to protect the peace of the Three Realms, ultimately perishing together. But is this truly the case? Who spread this rumor? What lies behind it? And where did the vanished Sun Wukong go? (Source: Bilibili, translated)