Daejeon is the fifth largest metropolitan city in South Korea. It is informally known as the science city by many Koreans. Expo '93, an international exposition, was held in Daejeon. KAIST, one of the top engineering/technology universities in the world, is located in Daejeon as well as other important research/development institutions. Daejeon sits between South Chungcheong Province and North Chungcheong Province. It is the home of 1.5 million people.