Cast: Erika Harlacher, Ye-jin Son, Johnny Yong Bosch, Kyung-gu Sol
The film is set in a luxurious 108-floor skyscraper, known as "Tower Sky," located in the heart of Seoul. The building is owned by a wealthy businessman and has a large number of residents living in it. On Christmas Eve, a fire breaks out in the building and quickly spreads, trapping the people on the higher floors.
While the party is in full swing, and while Young-cheol proposes a rose to Min-jung in an elevator, huge gusts of wind cause one of the helicopters to lose control and the attached lights crash into the glass bridge connecting the two Tower Sky buildings and into a side of one of the buildings. Another one of the helicopters then crashes into the building, causing the helicopter to leak fuel and the building catches fire. Shards of glass fall onto the partygoers below, which include Mr. Yoon (Song Jae-ho) and his friend Mrs. Jung (Lee Joo-shil), while another one of the huge lights falls and crashes onto a bus.
The rescue team, including the fire chief, Lee Dae-ho (played by Kim Sang-kyung), struggles to contain the fire and save the trapped residents while facing numerous challenges and obstacles.
Meanwhile, Lee's ex-wife and their two children are also caught in the fire, and he must find a way to save them. As the situation grows more desperate, tensions rise between the wealthy residents on the upper floors, who are desperate to be rescued first, and the poorer residents on the lower floors, who are struggling to survive.
Dae-ho moves quickly to save Ha-na, Yoon-hee and his colleagues. At the same time, firefighters Kang Young-ki (Sol Kyung-gu) and Seon-woo fight to bring the blaze under control, helping Dae-ho in the process. Together they fight to save the lives of everyone. While Yoon-hee, Ha-na, Young-cheol, Ming-jung and the others take refuge in the building's Chinese restaurant, the firefighters decide to contain the blaze at its origin, the 63rd floor, where the helicopter crashed. Despite containing the fire on that floor, it spreads further within the building.
Young-ki sacrifices his own life to save not only Seon-woo, but for all people in the future by detonating the switch manually inside the water storage tanks to allow the current to carry the remaining survivors through the sewers and out into the Han River since he accidentally dropped the remote control switch while on his way.
With time running out and the fire spreading, Lee and his team must make a daring and dangerous plan to save as many people as possible and prevent the tower from collapsing. Before the credits roll, the camera points out in the air towards 63 Building, with the remains of Tower Sky seen in the background as morning rises on Christmas Day, which is now left with a single 108-story skyscraper, with Yeouido District shrouded below by a cloud of dust generated by the collapsing ruins of the Riverview Tower.
