Soul of the Ultimate Nation (often abbreviated as S.U.N.) is a fantasy-based massive multiplayer online role-playing game

MMORPG

Massively multiplayer online role-playing game is a genre of role-playing video games in which a very large number of players interact with one another within a virtual game world....

 (MMORPG) produced by Webzen, a Korean-based company. It is operated in Korea

South Korea

The Republic of Korea , , is a sovereign state in East Asia, located on the southern portion of the Korean Peninsula. It is neighbored by the People's Republic of China to the west, Japan to the east, North Korea to the north, and the East China Sea and Republic of China to the south...

 by WebZen and in mainland China

Mainland China

Mainland China, the Chinese mainland or simply the mainland, is a geopolitical term that refers to the area under the jurisdiction of the People's Republic of China . According to the Taipei-based Mainland Affairs Council, the term excludes the PRC Special Administrative Regions of Hong Kong and...

 by The9

The9

The9 Limited corporation is a Shanghai-based online game operator which had the exclusive license to operate and distribute World of Warcraft in China , a license they secured after successfully aiding Webzen Games in distributing Mu Online in China...

. The game was launched in Taiwan

Taiwan

Taiwan , also known, especially in the past, as Formosa , is the largest island of the same-named island group of East Asia in the western Pacific Ocean and located off the southeastern coast of mainland China. The island forms over 99% of the current territory of the Republic of China following...

 on April 19, and in China on May 24, 2007 as a paid online service.

In December 2005, WebZen sold an export contract for the game to The9 for $13 million USD in total, which at the time was the largest single export transaction in Korea’s online game history.