as Dong-won: Portrays the relatable struggle of a man losing everything he worked for.

The disaster strikes during a housewarming party with his colleagues. A torrential downpour triggers a massive 500-meter-deep sinkhole that swallows the entire residential building in seconds. Trapped at the bottom are: , the desperate homeowner.

As a second storm begins to fill the hole with water, the survivors must set aside their differences and use their wits to escape before they are buried alive.