Seoul, South Korea has over 2,000 years of history as a capital and cultural city along the Han River. It developed rapidly in the 20th century, experiencing issues from concentration in its city center after World War 2. Seoul addressed these issues by expanding roads, building new apartment complexes, and developing new areas like Yeouido Island. In recent decades, Seoul has focused on becoming a smart, sustainable city through urban renewal projects, improved infrastructure like subways, redeveloping the Han River, and preserving historical resources while improving quality of life. Seoul has transformed into a global city in just 50 years through rapid but planned development.