After a successful retirement, Lim Dae-in unexpectedly regresses to the time of his initial awakening as a superhuman. He finds himself in a chaotic world struggling to adjust to monsters and the rise of superhumans, and he is quickly recognized for his abilities. Despite intending to retire within three years using his future knowledge, he is forced to fight against monsters and also deal with his past neighbors before deciding to focus on his re-awakening and physical condition.