The Hyperion Tower (Korean: 하이페리온 타워), also known as the Mok-dong Hyperion Towers, is a group of three buildings located in the Yangcheon-gu district of Seoul, South Korea, completed in 2003. The tallest of which, Tower A, is 69 storeys and 256 metres (840 feet) high, making it the second tallest building in Seoul and the world's 214th tallest building. The towers are used as residential housing. Tower A is the world's 19th tallest residential building