From Wikipedia:
The Korea Media Rating Board (KMRB) is a ratings organization in South Korea. They rate movies, videos, stage performances, and phonogrames. The current chairperson is Kyung-Soon Lee.
Initially, the KMRB also rated video and computer games; However, they rated a gambling game machine called Sea Story as if it were an ordinary game, due to a bribe, confusing the Korean game industry. After some controversy, the Korean government established the Game Rating Board for rating games in 2006.