Sudogwon
Covering only about 12% of the country's area, the Seoul Capital Area is home to more than 48.2% of the national population, and is the world's fifth largest urban area. This percentage has risen steadily since the mid-20th century, and the trend is expected to continue. Currently more than half of the people who move from one region to another are moving to the capital area. By 2020, it is projected that more than 52% of South Korea's population will live within the area, or 26,310,000 people. However, the Seoul Capital Area reached 25,620,000 people by 2015, bringing the chance of reaching a population of 26.31 Million in less than 5 years.