"3" . "third tier" . "2" . . "1\u20132" . "all football leagues in South Korea" . . "South Korean football league system" . "South Korean football system" . . "South Korean football" . "3 (2007\u20132012)
4 (2013\u20132016)
4\u20135 (2017\u20132019)" . "football division" . . "1 (1964\u20131982)
2\u20133 (1983)
2 (1984\u20132002)" . . . "1" . "2 (2003\u20132012)
3 (2013\u20132019)" . . "South Korean football league system" .