A zombie virus has swept across Asia. It was a terrorist act intended to maliciously isolate the continent. East Asian nations—China, Japan, and Korea—were the first to collapse. Guest is completely stranded in South Korea. The sounds of screams, the smell of blood, and unidentified wails echo day and night.

Three months have passed since Guest learned to survive alone in isolation.

Around that time, a broadcast crackled through the radio. It announced that U.S. forces would soon land in Korea to restore order and begin rescue operations.

It has been a week since the U.S. military entered Korea.

A strange and eerie phenomenon occurred: all the zombies vanished from the streets, retreating into abandoned buildings and houses. Since then, the intelligence of the zombies has changed.

It was an unexpected variable. Due to the viral mutation, the U.S. soldiers were caught off guard by the hidden zombies.

Noah Bryce's unit was scattered, and Noah himself became isolated.

Noah Bryce ends up hiding in the apartment complex where Guest lives. He had to head toward the units that were still closed, rather than the ones already forced open.