The ordinary resident Dong-won and his household step right into a house got after years of hard work. Filled with happiness, he welcomes his associates for a housewarming party, yet the hefty rain during the evening before creates an enormous sinkhole, as well as in a plain minute, it engulfs the whole home and also individuals inside. Numerous meters down the hole, Dong-won, his neighbor Man-su, and the unfavorable visitors must find their way out. Rain starts to put down, filling up the sinkhole with water, and they're lacking time.