K-League.

The Korea Professional Football League (K-League) is South Korea's only fully professional association football league. At the top of the South Korean football league system, it is the country's highest and most prestigious level of football competition currently contested by 16 clubs.The K-League was founded in 1983 as the Korean Super League, with five member clubs. The initial five clubs were Hallelujah FC, Yukong Kokkiri, POSCO Dolphins, Daewoo Royals, Kookmin Bank FC. Hallelujah FC won the inaugural title, finishing one point ahead of Daewoo FC to lift the crown.
In 1998, Korea's football league was reformed and renamed the K-League. Since its creation, the league has expanded from an initial 5 to 15 clubs. Of the 5 inaugural clubs, only Yukong Kokkiri, POSCO Dolphins, and Daewoo Royals remain in the K-League; Kookmin Bank FC dropped out of the league at the end of 1984, and Hallelujah FC followed the season after.The K-League champions, runner-up and third place gain entry to the AFC Champions League the following season, with the exception of Sangmu, due to their unique status as an army team, and therefore non-professional.
A number of the member clubs are owned by major Korean Chaebols, and the club names reflect that fact. Clubs have adopted local city names in an effort to integrate themselves more with the local communities; for example, Daewoo evolved over the years into Daewoo Royals, Busan Daewoo Royals, Busan I'cons and latterly Busan I'Park.
Following the 2002 FIFA World Cup, leaders of the K-League had hoped to transfer South Korea’s passion for its National Team to the domestic league. However, the K-League continued to flounder.Although a number of K-League clubs have relocated in the past, the Lucky Goldstar (LG) corporation caused a huge controversy[not specific enough to verify] at the end of 2003 when they made the decision to uproot their Anyang LG Cheetahs from the Seoul satellite city of Anyang and move into the empty Seoul World Cup stadium, becoming FC Seoul. Then following the 2005 season SK announced it was moving the Bucheon SK FC to the island of Jeju, where they became Jeju United.
In the 2009 season, Gangwon FC (Head Coach: Choi Sun-Ho, former Ulsan Hyundai Mipo Chosun head coach) joined the K-League as it's 15th member club. As such, the K-League had one or more club in every Korean Province in Korea.
This is the first time in domestic Korean professional sports history that there has been at least two clubs in each Korean province.
On April 5, 2010, Gwangju City has announced a plan to establish a football club by end of 2010 & to join the league from the 2011 season. On October 12, 2010, the club was approved to join the league as 16th member club.