Two Worlds: I Became a God in the Apocalypse

Ethan Wright, a disabled young man, unexpectedly gains the ability to travel between The Real World and The Wasteland. Using cheap supplies from the real world, he trades for gold and gene serum in the wasteland, gradually repairing his disabled body and building faith. Assuming the identity of a "God," he distributes supplies to settlements in the wasteland, sparking fierce competition among various factions while secretly investigating treatments for cancer. As his influence expands, he navigates between the Nobles of the wasteland, the leaders of Fortress 17, and his enemies in the real world. Ultimately, he activates "Project Spark" in an attempt to rebuild human civilization, completing his transformation from an avenger to a savior.

Synopsis from DramaGo.