Seal Online (씰 온라인) is a Massively Multiplayer Online Role-Playing game, originally developed by the Korean company Grigon Entertainment. In February 2007 Publisher YNK acquired the rights for the game, and in January 2009, the game was moved to the internal studio YNK Games. As of 7 February 2008, official versions of the game are available in South Korea, Japan, Taiwan, Thailand, Indonesia, and the United States.
The English version of Seal Online was expected to be released in Q3 of Year 2005 when Grigon Entertainment announced that there would be an English version of Seal Online. An English website was made by them. However within 2 months, the site closed down and there were no more news of an English translated version of the game.