Question: What group controls the team that Yeo Bum-kyu played for?

Context paragraphs:
Viessmann: The Viessmann Group is an international heating systems manufacturer headquartered in Allendorf (Eder), Germany.  The group controls 27 production and project management divisions in 11 countries, its products are available in 74 countries, owns 32 subsidiaries and 120 sales offices around the world.  Viessmann is a major winter sport and motorsport sponsor.

Yeo Bum-kyu: Yeo Bum-kyu (born June 24, 1962) is a South Koreaan football Midfielder who played for South Korea in the AFC Asian Cup.

El-Ad Group: The El-Ad Group is an Israel-based American real estate development company.  The group controls many subsidiaries including Elad Properties, which is based in New York City, Elad Florida and El-Ad Canada, which is based in Toronto, Ontario.

Privat Group: The Privat Group, or PrivatBank Group (Ukrainian: Група “Приват” , "Grupa "Privat"") is a global business group, based in Ukraine.  Privat Group controls thousands of companies of virtually every industry in Ukraine, the European Union, Georgia, Ghana, Russia, the United States and other countries.  Steel, oil & gas, chemical and energy are sectors of the group's prime influence and expertise.  None of the group's capital is publicly traded on any stock exchange.

315th Operations Group: The 315th Operations Group is a United States Air Force Reserve unit assigned to the 315th Airlift Wing.  The unit is stationed at Charleston Air Force Base, South Carolina.  The 315th Group controls all operational McDonnell Douglas C-17 Globemaster III flying squadrons of the 315th Airlift Wing.  It was activated in 1992, when Air Force Reserve Command implemented the Objective Wing organization.

SolarWorld: SolarWorld is a German company dedicated to the manufacture and marketing photovoltaic products worldwide by integrating all components of the solar value chain, from feedstock (polysilicon) to module production, from trade with solar panels to the promotion and construction of turn-key solar power systems.  The group controls the development of solar power technologies at all levels in-house.

South Korea national football team: The Korea Republic national football team represents South Korea in international association football and is controlled by the Korea Football Association.

Wywy Group of Companies: The Wywy Group of Companies is a Singapore conglomerate founded by billionaire Wong Yip Yan in 1976.  According to Bloomberg Businessweek, the Wywy Group was one of Asia’s largest non-real estate conglomerates.  The Wywy group controls 76 companies, with annual sales of over $900 million.  Main business lines for the Wywy Group are consumer electronics, entertainment centers, and America-style restaurants.  The Group was headquartered in the Wywy Industrial building on 12 Hoy Fatt Road in Singapore’s Redhill district.

Catcha Group: Catcha Group is an international Internet group founded by entrepreneur Patrick Grove.  The Group controls a number of publicly listed and private media, new media, online classifieds and e-commerce businesses, and is one of the largest investors in the digital sector in emerging markets, notably ASEAN.  Catcha Group and its related entities have completed over 60 investments either directly or indirectly, as sole, majority or minority shareholders.

M.P Birla Group: M.P Birla Group controls substantial assets of the Birla Group.  It also has interests in the other companies of the Birla family by way of investments in their equities.  It is named after Madhav Prasad Birla.

Supporting paragraphs: Yeo Bum-kyu South Korea national football team
Answer: Korea Football Association