The K3 League was a South Korean amateur football league held annually from 2007 to 2019. It was considered the third-highest division of the South Korean football league system before the K League 2 was launched in 2013, and the fourth-highest division since then. In 2017, it was divided into K3 League Advanced and fifth-tier league K3 League Basic, and introduced a system of promotion and relegation. In 2020, it was reborn as a semi-professional league after merging with the Korea National League.
The 2009 K3 League, also known as Daum K3 League 2009, was the third season of the amateur K3 League. All clubs played home and away season, and the playoffs were not held in this year. Before the start of the season, Changwon United and Seoul Pabal withdrew from the league, but Cheongju Jikji, Icheon Citizen and Seoul FC Martyrs joined the league.
The 2010 K League Championship was the 14th competition of the K League Championship, and was held to decide the 28th champions of the K League. The top six clubs of the regular season qualified for the championship. The winners of the regular season directly qualified for the final, and second place team qualified for the semi-final. The other four clubs entered the first round, and the winners of the second round advanced to the semi-final. Each match was played as a single match, excluding the final which consisted of two matches.
The 2011 Challengers League was the fifth season of the K3 League. The league announced its new name as Challengers League from this season. Playoff systems were used as the same as last season and league was divided two groups and play with home and away each other, with the winners of each stage and the two runners-up advancing to the post-season championship playoffs.
The 2012 Challengers League was the sixth season of the Challengers League. Playoff systems were used as the same as last season and league was divided two groups and play with home and away each other, with the winners of each stage and the two runners-up advancing to the post-season championship playoffs.
The 2013 Korean FA Cup, known as the 2013 Hana Bank FA Cup, was the 18th edition of the Korean FA Cup. Pohang Steelers became champions and qualified for the 2014 AFC Champions League.
The 2014 Korean FA Cup, known as the 2014 Hana Bank FA Cup, was the 19th edition of the Korean FA Cup. In 2013, South Korea's Ministry of Employment and Labor hosted the National Works Club Championship for the first time, and gave qualifications for the 2014 Korean FA Cup to its top four teams. Seongnam FC became champions and qualified for the 2015 AFC Champions League.
The 2015 Korean FA Cup, known as the 2015 KEB Hana Bank FA Cup, was the 20th edition of the Korean FA Cup. FC Seoul became champions and qualified for the 2016 AFC Champions League.
The 2016 Korean FA Cup, known as 2016 KEB Hana Bank FA Cup, was the 21st edition of the Korean FA Cup. Suwon Samsung Bluewings won their fourth FA Cup title after defeating defending champions FC Seoul in the final, and qualified for the 2017 AFC Champions League.
The 2017 Korean FA Cup, known as the 2017 KEB Hana Bank FA Cup, was the 22nd edition of the Korean FA Cup. The champions Ulsan Hyundai qualified for the group stage of the 2018 AFC Champions League. This edition introduced video assistant referee (VAR) system for the first time in Korean FA Cup history, using in the semi-finals and the final.
The 2018 Korean FA Cup, known as the 2018 KEB Hana Bank FA Cup, was the 23rd edition of the Korean FA Cup. Daegu FC qualified for the group stage of the 2019 AFC Champions League after becoming eventual champions.
The 2019 Korean FA Cup, known as the 2019 KEB Hana Bank FA Cup, was the 24th edition of the Korean FA Cup.
The 2019 K3 League Advanced was the 13th season of the K3 League Advanced. This is last season of K3 League Advanced. By 2020, the Korea National League will be absorbed into the K League or K3 League and rebranding as K3 League and K4 League.
The 2020 K3 League was the first season of the K3 League as a semi-professional league and the third tier of South Korean football league system. After the 2019 season, the former Korea National League and K3 League Advanced went defunct and rebranded into the K3 League. In the 2020 season, 16 teams are going to compete in the K3 League, and they are 8 teams from KNL, 6 teams from K3 League Advanced, and 2 teams from K3 League Basic. The teams for the 2020 season were announced by the Korea Football Association on 19 December 2019.
The 2020 Korean FA Cup, known as Hana Bank FA Cup due to sponsorship agreement with Hana Bank, was the 25th edition of the Korean FA Cup. Suwon Samsung Bluewings were the defending champions. As a change from the previous year, U-League teams did not participate; instead, the top eleven sides from the K5 League gained qualification.
The 2021 K3 League was the second season of the K3 League as a semi-professional league and the third tier of South Korean football league system.
The 2021 K4 League is the second season of the K4 League as a semi-professional league and the fourth tier of South Korean football league system. Paju Citizen are the defending champions and was promoted together with Ulsan Citizen to 2021 K3 League. Chuncheon Citizen and Jeonju Citizen were relegated from 2020 K3 League and will play in the K4 League for the first time. Icheon Citizen have disbanded due to financial problems and haven't registered for the league, while Yeoju Citizen has submitted a new entry in the competition after first announcing their disbandment.
The 2021 Korean FA Cup, known as Hana Bank FA Cup due to sponsorship agreement with Hana Bank, was the 26th edition of the Korean FA Cup. Similar to the previous year, U-League teams did not participate, and the top ten sides from the K5 League gained qualification instead.
The 2022 K4 League is the third season of the K4 League as a semi-professional league and the fourth tier of South Korean football league system. Pocheon Citizen are the defending champions and was promoted together with Siheung Citizen and Dangjin Citizen to 2022 K3 League. Pyeongtaek Citizen were relegated from 2021 K3 League and will play in the K4 League for the first time.
