The story, without the spoilers.
Yoon Sae-bom is a tough police officer in a special operations unit who has just found a way to move into a brand-new apartment building. Jung Yi-hyun is her old friend, a detective who has known her since high school, and he agrees to a fake marriage so they can qualify for the flat together. It is a practical deal between two people who trust each other completely. Then a strange new disease appears. People who catch it become violently thirsty, aggressive, and dangerous, and no one knows how it spreads. When the infection reaches their building, the doors are sealed, and the residents are locked inside together. Sae-bom and Yi-hyun must keep order among neighbours who turn on each other fast: some hoard food, some spread rumours, and some decide the rules no longer apply to them. Outside, a pharmaceutical executive watches the building like an experiment. Tense, clever, and surprisingly moving, this is a thriller about how quickly ordinary people change when they are afraid, and about the two people who refuse to change.
A little curiosity. A new favourite.
Start with the story, meet the cast, and make room for one more episode.