These leagues are governed by the Korea Baseball Organization (KBO).

Two unaffiliated teams joined the minor leagues in 2005: the Korean Police Baseball Team, operated by the Seoul Metropolitan Police Agency, and the Sangmu Phoenix, part of the Korea Armed Forces Athletic Corps.

Many KBO League players serving compulsory military service opted to play for the Police and Sangmu teams, usually for a term of two seasons.

Also in 2012, the third-level squad of Nippon Professional Baseball's Fukuoka SoftBank Hawks, began playing 12 games a year against Futures League teams.

)[4] In 2015, the Futures League reorganized into three divisions: the Red League (Goyang Dinos, Hanwha Eagles, Hwaseong Heroes, SK Wyverns), the Blue League (Doosan Bears, LG Twins, Police, Suwon KT Wiz), and the Yellow League (Kia Tigers, Lotte Giants, Samsung Lions, Sangmu Phoenix).