Unlike in Japan or the U.S. where nearly every high school fields a team, there are only about 60-70[1] Korean high school baseball teams which makes the competition tantamount to an all-star league of Korea's young talent.
KBO, MLB and NPB scouts are frequently in attendance at all of the five national high school baseball tournaments.
The five Big 5 tournaments are the most important high school baseball events of the year in terms of tradition, prize-money awarded, and public attention.
There used to be four lower-level high school baseball events of the year sponsored by local cities.
However, these local tournaments have been replaced with the High School Weekend League after the 2010 season.