Curfew sirens fade into a city that only moves in whispers. On‑jo (Park Ji‑hu) leads with soft‑spined courage, Su‑hyeok (Lomon) cuts corridors clear, and Nam‑ra (Cho Yi‑hyun) patrols the perimeter—part compass, part storm.

The cut ricochets from rooftop triage gardens to drone‑mapped alleys, a quarantine ferry grinding against a pier, and a classroom turned command post where chalk lines decide who gets saved next. Variants adapt: “listeners” hunting heartbeats, “climbers” stacking into living ladders, “lurkers” freezing until the lights blink.

Teens run rail‑to‑rail chess—LED‑lure minefields, metronome traps, zipline extractions through a mall atrium lit by flare snow. Radio chatter knots into friendship vows; guilt meets grit; mercy costs. The score is pulse and panic, then oxygen. Final sting: a school bell rings in the ruins, doors swing open, and this time the kids step in first.