We all know viruses spread fast. But what if something far more dangerous is riding along with it? Something that doesn't want to kill the human race... It wants to rule it. This story follows Asha, a quiet girl who's always felt out of place. Mark, her protective stepbrother who loves her like his own blood. And Orson, a global K-pop idol-and Asha's childhood sweetheart-who's suddenly back after years. Their lives collide again just as chaos erupts at Busan High, where a mysterious virus starts infecting students. But these aren't mindless zombies-they're different. Smarter. Stronger. Some can even think... some can choose. As the school turns into a locked-down nightmare, the students must fight to survive- Not just to stay alive, but to stay human. Can Asha and the others escape the School of the Undead? Can they protect each other ? The virus is just the beginning. And the real horror? It's evolving.