Apocalypse Sign-In: From the Start, I Awakened Ten-Thousandfold Combat Power

[Doomsday zombies + power fantasy + supernatural talents + squad growth + comedy + hidden powerhouse] The apocalypse arrives, and trillions of living beings turn into zombies. The protagonist accidentally activates a Sign-In System. Every time he signs in at a new location in the abandoned city, he receives an incredible reward. While everyone else struggles to survive the apocalypse, he rises step by step through signing in. Then, when a sign-in unexpectedly reveals a shocking truth about the end of the world, he realizes this disaster may not be a natural one...