Just across the street. Large park with exercise equipment, badminton courts, and golf range.
“Central City is a humongous shopping area includes Marriott hotel, Shinsegye department store, Megabox movie theater, Seoul express bus terminal, Gangnam flower market, underground shopping mall and so on. It's literally a city rather than just a shopping place because it's extremely big. You'll need to spend entire one day to explore Central City.”
“Rooms here from $150/night. Airport bus stop is located here(5th stop on bus #6006 from ICN airport)”