In modern society, a mysterious curse has come. A driverless bus brings a group of people who do not know each other but are all cursed to a black treacherous house in the deep mountains and forests. The blood-stained door in the treacherous house becomes a turning point in everyone's destiny. Every time a certain time passes, the bloody door will open, forcibly pulling everyone into the terrifying world behind to perform unknown tasks. If the task fails, they will face death.
