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A significant reason audiences search for this film over a decade later is its technical prowess. Director Kim Ji-hoon utilized massive practical sets, including a seven-story replica of the building’s restaurant and atrium, to film the fire sequences.

To ensure authenticity, the production used real fire on set. This made filming dangerous for the actors, who often had to work without gas masks amidst poisonous fumes. thetower2012koreanmoviewatchonlineengsub verified