The 2011 South Korean football betting scandal involved South Korea's top professional football leagues, K-League. In mid-2011, South Korean association football, especially K-League, was overshadowed by the discovery of match fixing scandal among the players, brokers such as gangsters and coaches in K-League.
After an arrest warrant was issued for two football players on 25 May 2011 by the Supreme Prosecutors' Office, the K-League's match-fixing case began to surface. The prosecutors arrested two brokers and are investigating 10 players, including Sangju Sangmu Phoenix's striker and former national team member Kim Dong-hyun. The inception of this scandal was the alleged suicide of one footballer named Yoon Ki-Won of Incheon United. His suicide was amplified with the match-fixing allegations through media and football fans. But K-League trying to purified itself and other persons who were involved in match-fixing didn't appear, match-fixing scandal was an open secret in K-League through the illegal betting sites.
On 7 July 2011, Changwon division of Supreme Prosecutors' Office revealed fifteen match-fixing matches.
Bold team is leading the match-fixing
|League Cup||2 June 2010||Sangmu||1–1||Seongnam||Failure|
|6 June 2010||Ulsan||2–0||Sangmu||Success|
|17 July 2010||Daejeon||0–4||Jeonbuk||Success|
|K League||18 July 2010||Daegu||1–3||Suwon||Success|
|24 July 2010||Incheon||2–3||Jeju||Success|
|25 July 2010||Daegu||1–1||Gyeongnam||Failure|
|31 July 2010||Gyeongnam||3–2||Incheon||Success|
|7 August 2010||Daegu||1–3||Daejeon||Success|
|7 August 2010||Jeju||4–0||Sangmu||Success|
|28 August 2010||Sangmu||1–1||Gyeongnam||Success|
|29 August 2010||Busan||5–3||Chunnam||Success|
|4 September 2010||Chunnam||3–0||Daejeon||Success|
|18 September 2010||Ulsan||3–0||Chunnam||Success|
|19 September 2010||Daejeon||3–0||Sangmu||Success|
|27 October 2010||Busan||0–1||Suwon||Success|
On 4 August 2011, Changwon division of Supreme Prosecutors' Office revealed additional four match-fixing matches.
|League Cup||6 June 2010||Seoul||5–1||Sangmu||Success|
|K League||9 October 2010||Seoul||3–2||Gyeongnam||Success|
|27 October 2010||Jeju||1–1||Seoul||Failure|
|3 November 2010||Sangmu||0–1||Chunnam||Success|
Also, 2011 season's two matches were related match-fixing.
|League Cup||6 April 2011||Busan||1–0||Gwangju||Success|
|6 April 2011||Daejeon||0–3||Pohang||Success|
The reports of the arrests of two footballers by the South Korean media had led to the exposure of the initial match-fixing scandals in the K-League. Especially, former national football team member Kim Dong-hyun, who was believed to have deep connections to accomplices. The arrested footballers were Park Sang-Wook of Daejeon Citizen and Sung Kyung-Mo of Gwangju FC.
On 27 May 2011, four players of Daejeon Citizen were also arrested and more extensive investigations were held into match-fixing. On 30 May 2011, former footballer Jung Jong-Kwan, who played for Jeonbuk Hyundai Motors was found dead in an apparent suicide. In his suicide note, he said "I’m ashamed of myself as a person involved in the match fixing scandal. Those under investigation are all my friends and they haven’t blown my name because of friendship. All is my fault and I got them involved."
On 17 June 2011, the Changwon division of Supreme Prosecutors' Office announced an investigation result of match-fixing. Ten football players were banned from playing in the South Korean football permanently. Kim Jung-Kyum of Pohang Steelers was banned for five years in South Korean football, because he made unfair profits from the knowledge of match-fixing. Daejeon Citizen's dividend of Sports Toto was reduced 30% for the 2011 season, and Gwangju FC and Sangju Sangmu Phoenix was reduced by 10% each.
After first investigation ended, Changwon division of Supreme Prosecutors' Office and the military prosecution broadened the scope of the investigation. The first investigation was focused on related to Daejeon Citizen's players, second investigation was focused on related to Chunnam Dragons' players.
On 7 July 2011, Changwon division of Supreme Prosecutors' Office announced investigation result of match-fixing. Ten retired and active football players were arrested on related match-fixing. And 29 retired and active football players were under indictment and three players were summarily indicted.
Kim Dong-hyun (Sangju Sangmu Phoenix), Park Sang-Wook, Sin Jun-Bae, Yang Jung-Min (all Daejeon Citizen) were arrested in 1st investigation, but weren't arrested in 2nd investigation.
On 12 July 2011, Sangju Sangmu Phoenix's manager Lee Soo-Chul was arrested for accepting bribes and intimidation charges in 2010 season.
On 29 August 2011, the Changwon division of Supreme Prosecutors' Office had sentenced thirty-nine retired & current footballers to imprisonment, and fines of 5 million won and as many as seven-years jail sentence.