Christmas Day—At Tower Sky, the ultra-luxurious landmark 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 his plans with his daughter Ha-na on Christmas day to work the event. The party is in full swing with two helicopters spraying snow on the partygoers below, when suddenly, one of the helicopters crashes into the building and sets it ablaze. Young-ki is a legendary firefighter, throwing himself into the burning building to save the lives of strangers. Together, Young-ki and Dae-ho must fight to save the lives of everyone around them, but only one can survive, while the other makes the ultimate sacrifice.