Yoon-Taik Chung

Part of HYOSUNG Corp., Hyosung Goodsprings Co., Ltd. is a manufacturer of liquid pumps. The company is based in Seoul, South Korea and was founded in 1989.

Part of Hitachi Ltd., Hyosung Information Systems Co., Ltd. is a South Korean company that wholesales computer peripheral equipment and software. The company is based in Seoul, South Korea.

Hyosung Trans World Co., Ltd. is a South Korean company that deals with chronic hepatitis delta virus (HDV), which is the most severe form of viral hepatitis. The private company was founded in 1997 and is based in Seoul, South Korea. HDV occurs only as a co-infection in individuals who have hepatitis B virus (HBV). and has subsidiaries in South Korea. It is estimated that at least 12 million people worldwide are likely currently co-infected with HDV and HBV. Chronic HDV is associated with a faster progression to liver fibrosis, cirrhosis, and hepatic decompensation and an increased risk of liver cancer and death. In the US and Europe, it is estimated that there are more than 230,000 people living with HDV; however, it remains widely underdiagnosed around the world.

Doomi Construction Co., Ltd. provides building construction services. The private company is based in Icheon, South Korea.

Hyosung Toyota Corp. is a official dealer of Toyota in South Korea. Its products include Avalon, Camry, Prius, RAV4, Sienna, and Toyota86. The company was founded on October 6, 2009 and is headquartered in Seoul, South Korea.