The text discusses different tall buildings in South Korea, specifically in Seoul. The current tallest building is the Lotte World Tower at 555m, which was completed in 2016. The second tallest building is the 63 Building at 249m, followed by the Hyundai Perion at 256m. There is no specific standard for a skyscraper, but in the past, buildings over 200m were considered tall. However, now there are even domestic buildings over 200m. The Lotte World Tower also includes multiple functions such as housing, offices, hotels, and shopping. In South Korea, this building is considered a representative landmark. The tallest building in the world is the Burj Khalifa in Dubai at 828m, followed by the Tokyo Sky Tree and the Shanghai Tower.