My Doomsday Shelter Rebuilding Plan

One day, an extraterrestrial meteorite carrying radiation destroyed all civilization on the blue star. Even if the people who survived established shelters, they still could not escape the fate of extinction after struggling for hundreds of years. At this point, Chu Shixiu, who came from time-travel, shouldered the heavy responsibility of repairing the Sanctuary and saving the world. With the help of the Sanctuary, he wandered through the 'timelines', seeking the 'possibility' of the survival of human civilization. (Timeline possibilities: biohazard, future world, natural disasters...) (Farming land reclamation article)