Goddess of Oblivion Meng Po manages the underworld and takes care of daily affairs. God of Love Yue Lao in the heaven is in charge of marriage and wedding affairs. One red and one white, they were originally unrelated mythological characters, but they are inextricably linked. The movie "The Origin of the Legend of Meng Po" takes fate and mythical love as its themes, and deeply explores the past and present lives of Meng Po and Yue Lao, two mythical figures with extremely high public recognition and conflicting functions.

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.

The fairy sister Xiaojiu, who is thousands of miles away from the earth, is sent by the five elders to find the magpie stone and save the magpie city in danger. He was accidentally shot down by a gravitational wave experiment conducted by Xue Hai, a man with high IQ. A "farce" with the real purpose of picking up girls and looking for the magpie stone unfolded crazily during the 30 days when Xiaojiu fell into the mortal world. With the development of the situation, the big boss hidden behind gradually surfaced, in order to protect Dream and love, Xue Hai chooses to fight with Xiao Jiu and fight against the dark forces.

The two sisters of Lingshe Mountain - White Snake and Green Snake - devoted themselves to cultivating of immortality. The White Snake was in danger during the tribulation. Fortunately, Xu Xian, who went to the mountain to search for medicine, rescued her. In a dream White Snake learns the words of the poem "Enter the world, know the warmth and the cold" and enters the city in search of a cause. The Great Demon King of the Yin Division coveted the White Snake's pearl for nearly a thousand years. Knowing that the White Snake is alive, he sent his subordinate judges to seal the city for her search. White Snake meets Xu Xian and cures his classmate Gao Jin's critically ill father. When he finds out that the White Snake is a demon, he tells the Underworld that he will take revenge.

Once celebrated as a prodigy, Yang Qianhuan, the third disciple of the Imperial Observatory, is cast into obscurity with the rise of Xu Qi'an. Despite being told that his fate is sealed, he refuses to surrender, determined to defy destiny and reclaim his place through his own strength.