Apocalyptic Super System

The apocalypse has arrived and the world trembles in terror as Earth becomes a hunting ground for zombies and mutants. Zhao Tianlei stumbles upon a mysterious Super System and although he is no saint, how can he stand by and watch while his classmates are slain and the Earth is in such a tragic state? With the Super Upgrade System and Exchange System, will he be able to lead the humans to defeat the zombies, and restore human civilization?