I've never been a true fan of baseball in America, it's just a little too laid back for me. I want lots energy in my professional sports, both from the players and the fans. South Korean baseball is exactly that, non-stop excitement. Much like baseball in Japan, the fans are spectacular in Korea. There's constant cheering, clapping and making as much good-hearted noise as possible. From before the first pitch until it's time to go home. I missed the first pitch of the game because I assumed the fans would stop singing and swatting together their inflatable noise makers once the game properly started. Along with the help of a cheerleader, who reminds you of the true meaning of the word, they use any opportunity to cheer for their team or just sing the latest Psy song.
Baseball was introduced to Korea be American missionaries in 1905 and has become the most popular sport in the country (second only to maybe Starcraft and hating Japan). The South Korean national team has been incredibly successful. They won the gold medal at the Beijing Olympics and consistently rank in the top 3 internationally.
All of the teams are owned by large business conglomerates who put their names on the team as a way to help advertise their brand. For example, there's the Kia Tigers down south in Gwangju, the Samsung Lions in industrial Daegu and the LG Twins in Seoul. Hyundai even had a team called the Unicorns up until 2008.
Every single player on a Korean baseball team has their own song that the fans will sing when they come up to bat. The songs are all viewable online and you can download apps to your phone so you can practice and memorize the songs before the game. A lot of the songs lyrics are simple encouragement and team rallying, with lyrics along the lines of "Let's go [player's name]!" "[team name] is invinsible!"
There's absolutely no question which LG Twins players has the best cheer, it's Jo Yunjun. He let his true personality shine with choosing for his cheer to be set to the tune of ABBA's "Dancing Queen." The lyrics roughly translate to: "Wooooo! Jo Yunjun! Jo Yunjun! WoooOoooOoooOooo! LG's Jo Yunjun, blow us all the way up to the sky!"
Bringing in outside food and alcohol into the stadium is practically encouraged, you can even have food delivered to outside the stadium for you to pick up right before the game starts. Some stadiums even have picnic areas with views of the field.
But even if you don't bring your own supplies there are tons of options both. Right outside the stadiums are vendors selling all sorts of food and drinks, including pizza, chicken wings and more traditional Korean fare like anchovies, kimbap and pressed squid. Food and drinks inside the stadium are sold for the same prices you'll see anywhere else in Korea, including beer in the $2-3 range.
One regret of my time in Korea was that I never went to more baseball games. That, and that I never went to a soccer game, which I hear draws a similar exciting atmosphere.