Modern web novelist Tang Yu dies suddenly after staying up all night to meet a deadline, then transmigrates to the world of Journey to the West, before Sun Wukong is born. He awakens the “Journey to the West Merit System”: by rewriting the original plot, he can earn merit points and exchange them for cultivation, magical treasures, and all kinds of techniques.
Practical, ruthless, and determined to repay every slight, he uses his foreknowledge of the story to plan ahead: he claims the spiritual root of Flower-Fruit Mountain, guides Sun Wukong into learning his arts early and binds him to his side, then recruits the Little White Dragon as his mount. He beats Xuanzang, the reincarnation of Jin Chanzi, to the punch, subdues Zhu Bajie and Sha Wujing, and builds his own team to make the journey west in reverse. He slays the White Bone Spirit and other villains with ease, stands up to Guanyin, forces Taishang Laojun to hand over golden pills, and debates the Buddha for the true scriptures.
Later, he establishes a Heavenly Court for demons, crushes the celestial army, brings Buddhism under his control, and unifies the underworld. After meeting Hongjun and obtaining primordial violet energy, he becomes ruler of the Three Realms. Then he fights extraterrestrial demons and destroys the Chaos Demon Gods, ultimately breaking through to the Eternal Realm. He merges the Three Realms and primordial chaos into a superworld, becoming the Eternal Lord who commands all things and completely overturning the original fate of Journey to the West and the Three Realms.