"100 Million" Space

The protagonist came to a different space due to an accident, but he was not the only one. There were a thousand people. They have to survive in a huge campus full of zombies. People can also be infected into zombies. Zombies also have levels, and humans have to fight against zombies by searching for materials. The protagonist has a heaven-defying system, and the system will help him, and finally escape from the different space and return to reality. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.