The Only System Owner in the Apocalypse

Suddenly, an inhuman howl came from outside the private classroom, and at the same time there were chaotic footsteps and calls for help. "Help, it's killing someone!" "Call the police! Call the police!" "Look, how did the man whose neck was bitten through just now get up?" Lei Xuan, who often watches zombie movies, was agitated and thought to himself: Damn it, there won't be a biochemical crisis! Beep, low-level zombies detected, system activated! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.