Apocalypse: Lock the Campus Belle in Prison from the Start

"Ding-dong. The System has detected an obvious crime in progress. Offender: school belle. Gender: female. Crime: intentional murder. Age: 19. Crime rating: A. Eligible for immediate transfer to the high-security cell. Would you like to make the arrest now?"

What, a prison System? Lin Mu is stunned. What is this thing? And why can this System only catch female criminals?

After he throws the school belle into prison, he gains 1 experience point. As the number of inmates grows, the prison will level up and its conditions will improve. Lin Mu will also gain different abilities, while all sorts of mutated zombies will become a terrifying threat to humanity.

As the zombies descend, how will Lin Mu build his prison into a happy haven amid all the dangers?