The End of the World! My System Can Be Upgraded

The world suddenly changes, the apocalypse comes, animals mutate, and major cities around the world fall. Kill the mutants and gain energy, and humans will launch a counterattack against the mutants. However, in the apocalyptic world, morality has declined and the law has become a bubble. Zhou Fan, who has awakened the system, is determined to establish order again in this apocalyptic world. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.