In a small army unit, far from the outside world, there is a young soldier hiding a secret he doesn't want to share. Every time he stands guard during the night watch, he sees smoke rising from the forest. However, for some reason, it seems no one else can see the smoke.

After a devastating plague wiped out all livestock, a world where humans hunt humans out of greed has emerged. Jung-mi, who lives alone in hiding to survive by avoiding other humans, is suddenly visited by her daughter Hye-won—whom she was separated from three years ago while fleeing—carrying a mysterious bag.