Lee Dae-ho is a single father and manager of the 120 story luxurious landmark building complex, Tower Sky in Seoul. He is an earnest employee liked by his colleagues and is secretly in love with Seo Yoon-hee, a restaurant manager. The owner of the complex, Mr. Jo decides to hold a "White Christmas" party for tenants and VIPs on Christmas Day, with helicopters circling above, sprinkling snow onto the party. Dae-ho has promised to spend the day at an amusement park with his daughter Ha-na, but had to cancel when he is needed at the party.
Whilst the party is in full swing one of the helicopters crashes into the building and the building catches fire. Dae-ho moves quickly to save Ha-na, Yoon-hee and his colleagues. At the same time, firefighter Kang Young-kee fight to bring the blaze under control, helping Dae-ho in the process. Together they fight to save the lives of everyone, despite a feud between the two men.