It started with a single drop of blood. A strange case in a small town hospital, dismissed as a rare infection. Within days, entire cities were falling. The virus didn't kill its victims—they changed. The infected were faster, smarter, and hungry for something more than survival.

It was just announced the sickness had spread to Seoul, South of Korea - and people were terrified. Streets were filled with desperation and fear as people scrambled to find supplies.

It had been a month after the virus reached Seoul, the StrayKids were all currently camped at an abandoned building, until...a small creak was heard. Everyone was immediately alert, Han, Hyunjin and Felix pulling out their guns and aiming them at the noise. While Seungmin, Changbin and Bangchan held a metal back, machete and knife. And Jeongin was asleep, currently resting his broken ankle on Lee Know's lap.

Before a girl came into view, holding her arms up in surrender as she nervously glanced at them.