The story follows the protagonist Yun Shu, who is determined to find the whereabouts of the Monkey King, Sun Wukong, to overthrow the tyrannical rule of Yan'er, the unruly monkey. During the search, Yun Shu gradually discovers that Sun Wukong's disappearance is connected to the Demon Lord's plot to break the seal and regain control of the Three Realms, with Yan'er being just a pawn in the Demon Lord's scheme. Ultimately, with the influence and help of the goddess Xi He, Yun Shu transcends his limitations, prevents the opening of the sealed gate, and becomes a true hero.
In the early years of the Republic of China, the corrupt Qing government is overthrown by the revolution, and the trend of democratic progress rapidly sweeps across the entire land. However, aside from the chaos of the era, the underdevelopment of the people's wisdom, ignorance, and feudal superstition are still rampant throughout China. The son of the police officer Wang Zhizhang dies due to opium and he disdains the old society for the widespread crime and feudal ideology that poison the people’s minds. Hence, he disguises himself as a Taoist and infiltrates the local businessman Mr. Chen's house to investigate the opium smuggling case.