Watching baseball is a must in Korea. Jamsil Stadium, home of Nexen Heroes, is the most convenient location for travelers visiting Seoul. Baseball is HUGE in Korea and everyone goes to cheer their favorite team. Actually, even if you do not know a thing about baseball, it will still be an entertaining experience watching flash-mob like cheers, chewing on fried chicken and burgers, and waving your stick balloons at all times. Like everyone mentioned, baseball tickets are cheap at around 10,000 won. Considering that it is a 3~4 hour entertainment, this is an amazing value.