My System in the Apocalypse Is a Green Grassland

(The end of the world + system + rebirth + stocking up + cute pets) The weak eat the strong, and the fittest survive. Zombies are coming, animals and plants mutate, civilization is destroyed, global temperatures drop rapidly, Chaoyang, who starved to death in his previous life, is unexpectedly reborn, seizes the opportunity, and settles in. He originally wanted to survive until the end, but he didn't expect a greater danger to come quietly...