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A refugee camp. On-jo stares at her phone—a voicemail from Cheong-san, recorded during the fire: “Hey. If you’re hearing this, I’m gone. But remember the rooftop? You said the world wouldn’t end. It did. And you still found me. So don’t stop finding people, okay? Even in hell.”

While the gore effects are top-notch, the heart of the show is the character dynamic. It explores the breakdown of social hierarchies. The bullies, the outcasts, the class president, and the slackers are forced to work together. It asks the classic question: Who is the real monster? The zombies, or the humans trying to survive?