Waking up in a world reminiscent of late Victorian-era England, Zhou Mingrui finds himself having transmigrated into the body of a history graduate named Klein Moretti, who lives in a city called Tingen. In this new world, he discovers the rising tide of steam power and machinery, alongside the existence of Beyonders—people who gain mystical powers through consuming Potions that correspond to one of the 22 'Pathways.' After an accidental ritual, Klein inadvertently establishes a mysterious, omnipotent entity presence and begins forming a clandestine organization known as the 'Tarot Club,' masquerading as a god-like entity known as "The Fool." As he delves deeper into the world's hidden history and supernatural secrets, including dangerous sealed artifacts, ancient languages, and cosmic entities, he must learn to master the "Acting Method" to digest his Beyonder potions and avoid the corruption and madness that constantly threaten to consume him, all while searching for a way to return to his original world. The story is a dense, high-stakes epic that blends meticulous world-building with elements of cosmic horror, fantasy, and mystery.