C1026 Intrusion

First, where did this group of people come from, and why did they target Ye Ling's company from the beginning? Second, ordinary people can only become like this by injecting a vaccine, then where did these vaccines come from?

Clang! Clang! Clang! Boom! * Boom! * Boom! *

The door outside shook violently, and the sound of the door being smashed came closer and closer