Beer was introduced to Korea by Europeans in early-20th century. Both of current major breweries date from 1920s. The third participant, Jinro Coors Brewery, was founded in 1990's, but was acquired by OB later.

The Korean beer market is dominated by two major companies, Hite-Jinro

Hite

Hite Brewery Company Limited is a South Korean brewery company headquartered in Yeongdeungpo-gu, Seoul. Its main products are beer, rice wine, and mineral water. The company was established as Chosun Breweries in 1933...

, and OB

Oriental Brewery

Oriental Brewery or OB is a South Korean brewery established by the Doosan Group in 1952. It was purchased by InBev in 1998. In 2009, it was sold by Anheuser-Busch InBev as the parent company sought to reduce its debt. It was sold to an affiliate of Kohlberg Kravis Roberts & Co....

, and those two provide several brands in local market. Most restaurants and bars will only have one on tap, as they are largely regarded as similar in taste and price (they are mostly brewed from rice).