Buy a ticket to see a game at Mokdong Stadium. If there's nothing happening while you're in the area, you might like to check if the stadium offers a tour of the grounds.
If you're staying a while in Yangcheon-gu, Mokdong Stadium is a fine place to kick off your exploring. This sporting facility is one of numerous attractions that'll keep you busy here. Gyeongbokgung Palace, National Museum of Korea, and N Seoul Tower are also waiting for you nearby.