Baseball has attack turn and Defense turn. In defense turn, there are 9 players. The pitcher, catcher, first to third baser, short stop, and three outfielders. In attack turn, there are 9 players in lineup. The fielders, and designated hitter without pitcher.

In Korea, There's a 10 baseball stadiums use by pro. 2 stadiums are in Seoul, and other 8 spread everywhere. The oldest stadium is in Seoul, the Jamsil stadium. It built in 1982, when KBO started. There is one dome stadium in Korea. It is in Seoul, Kochuk. It's small but can play even it rain.

There are permanent number in baseball. Every team got their permanent number. We can use permanent number. It is for remember that heroic player. In my favorite team Doosan, There are two permanent number 21 and 54