Korea is facing a population decline crisis, compounded by the emergence of a new virus called PT3 that destroys red blood cells. The only treatment is transfusion of young blood, but with only 11 million elderly patients eligible for donation and a mere 900,000 young donors, the price of blood has skyrocketed. This movie weaves a richly imaginative and genre-filled narrative about population decline, presenting a story that is masterfully executed.