K4 League

The K4 League is a football competition in South Korea. Created in 2020, it is a considered the fourth tier of South Korean football league system. After the 2019 season, the former amateur league K3 League Basic became defunct and was rebranded as the semi-professional league K4 League.
Competition format.
The promotion and relegation system exists between the K3 League and the K4 League, both being semi-professional leagues. However, since the 2021 season, teams from professional leagues K League 1 and K League 2 were allowed to create reserve teams set to play in the K4 League, in order to give academy players and/or other registered players more game time.
Former clubs.
The list does not include promoted or relegated clubs.