A sudden zombie virus outbreak hits downtown Seoul, forcing soldier Jaeyoon and his girlfriend Youngju—recently separated—to fight for survival apart. Jaeyoon becomes trapped in a military base and a high-rise, while Youngju is stranded in the city center. As they search for each other, they encounter zombies, survivor conflicts, and experience both loss and help from those around them, ultimately reaffirming their love and hope. After many trials, they reunite, but the zombie crisis remains unresolved. Mixing black comedy and humanism, the drama highlights unchanging love and solidarity even in extreme times.