"Haepiniseu" is a Korean horror film about the mutation of a coronavirus. For several years, people around the world have been forced to exist in a pandemic. Unexpectedly, some begin to feel an immense thirst, turning into zombie-like creatures and attacking those around them. Yun Se-bom, a brave girl from the counter-terrorism unit, has to deal with one of these monsters. After being scratched by this person, she goes to a crisis center where specialists are fighting the new infection.