Klein Moretti is the central character of the web novel Lord of the Mysteries, written by the Chinese author Cuttlefish That Loves Diving. Originally a young man from modern-day Earth, Klein is transported — or rather, reincarnated — into a Victorianesque, steam-punk fantasy world filled with eldritch horror, secret organizations, and a complex system of supernatural pathways. Armed with fragmented memories of his past life and an analytical, cautious mind, he joins the Nighthawks, a church-affiliated organization that investigates supernatural incidents. What makes Klein particularly compelling is his use of an extraordinary ability: access to a mysterious space above the gray fog, where he can communicate with powerful beings and even manipulate fate itself by writing "acting" scripts for himself. Throughout the story, he adopts the persona of "The Fool," ascending through the ranks of a mystical tarot-themed organization while carefully concealing his true identity and origins. His journey is one of survival, growth, and the gradual unraveling of the world's deepest cosmic secrets.