query: headquarters_location koscom
supports: Busan;, officially Busan Metropolitan City(), romanized as Pusan before 2000, is South Korea's second most-populous city after Seoul, with a population of approximately 3.6 million. The population of the metropolitan area, including the adjacent cities of Gimhae and Yangsan, is approximately 4.6 million. The city is located on the southeastern-most tip of the Korean peninsula. Korea Exchange (KRX) is the sole securities exchange operator in South Korea. It is headquartered in Busan, and has an office for cash markets and market oversight in Seoul. Koscom ( acronym of Korea Securities Computing Corporation Korean :  , Koscom ) is a Korean financial IT solutions company launched by the Ministry of Finance ( MOSF ) and the Korea Exchange ( KRX ) in 1977 . It has five corporate divisions with providing IT infrastructure to the Korean financial securities and futures market . Koscom also offers online stock trading systems that enable users to access to financial database and place trades by Home Trading System or using a customized terminal for professional traders in securities as well as other electronic financial services . Major Korean financial firms have subscription to the Koscom 's online trading services including market news , price quotes and financial market data . Seoul ()  officially the Seoul Special City  is the capital and largest metropolis of the Republic of Korea (commonly known as South Korea), forming the heart of the Seoul Capital Area, which includes the surrounding Incheon metropolis and Gyeonggi province, the world's 16th largest city. It is home to over half of all South Koreans along with 678,102 international residents.
candidates: busan gimhae incheon seoul south korea
answer: seoul