Mountains and Seas Descend, and Civilization Begins to Be Rebuilt from the Oasis

Global resources are scarce, the population has dropped sharply, and human beings are struggling to survive. Zhang Yan traveled back through time a year ago and had no system. A memory and a countdown appeared in his mind out of thin air. When the one-year period was about to come, he was expelled from the city because he lost supplies. At this time, the national destiny was coming. Search for basic survival supplies in the deserted city, survive in the wilderness, and obtain tangible resources after clearing the level, but this is still the beginning...