Lotte World Tower, is a 123-story, 555 m supertall skyscraper, located in Sincheon-dong, Songpa-gu, Seoul, South Korea. It is the sixth-tallest building in the world, the tallest in OECD countries, and also the first in South Korea to be over 100 stories tall. It was the fourth-tallest in the world when completed in 2016. The tower opened to the public on April 3, 2017. Haeundae LCT The Sharp in Busan is the second-tallest building in the country.