A blaze broke out at around 11:07 p.m. Thursday at the 33-story Samhwan Art Nouveau commercial and residential building in Ulsan, sending hundreds of people to evacuate.
The fire has been extinguished completely as of Friday morning.
At least 88 people were taken to nearby hospitals for treatment for smoke inhalation, but no deaths were reported, officials said.
Investigation is under way to find what caused the fire.
Witnesses said that the exterior walls of the building, possibly insulation, appear to have caused the fire to spread quickly.