Sinkhole

Middle-manager Park Dong-won saved up for 11 years to buy a home in Seoul for his family of three. When the Parks move in to their condo, they notice some structural glitches, like a slanted floor. But they are more alarmed by their weird neighbour Man-su. As Park's co-workers gather for his housewarming party, the building collapses and sinks into a nearly bottomless pit below. The survivors have to improvise and cooperate to get out alive.