When Dr. Keui saw the infected villagers via video chat, he immediately told Dr. Kwang to put them in a secure room and lock the door. He also asked if his friend was armed.
Dr. Kwang asked why he would be armed (clearly, he's not a fan of horror films). Dr. Kuei didn't answer, only saying support was on the way.
Helicopters arrived with the "support." They claimed to be from the Ministry of Health, but their strut said they were the Guoanbu (a.k.a. highly trained intelligence agents).