A working class family move into a new condo purchased after 11 years of hard work. They throw a housewarming party to show his co-workers when overnight a heavy downpour creates an extremely deep sinkhole that engulfs the entire building.

On Christmas Eve at Tower Sky, an ultra-luxurious building complex, a White Christmas party is held to dazzle its equally high-end tenants and VIP guests. Dae-ho, the manager of the building and single father, is forced to cancel plans with his daughter Hana to work the event. His Christmas is saved when Yoon-hee, the food mall manager with a secret crush on Dae-ho, offers to babysit Hana during the party. Meanwhile, Young-ki the legendary fire chief of Yoido Station has finally promised his first holiday date night to his long suffering wife. The party is in full swing with the spectacular sight of two helicopters flying overhead just to spray snow on the partygoers and make everything perfect. When unthinkable disaster strikes, Dae-ho and Young-ki must summon all their strength and courage to save the lives of thousands but at what cost to themselves and their loved ones?