It is Korean developer Alt1's first released game set in the Oriental Fantasy universe launched in its home market in 2004.

[1] Aeria Games announced Twelve Sky Closed Beta on September 5, 2007.

[5] There are multiple private servers running as of 2023 for the EU/NA communities, most prominent among them is the international project V-Sky, ran by Vortex Gaming.Vortex Gaming - 12 sky 2 The main premise of V-Sky is constant new updates of the latest CN version of the game, including 4th new faction, the Hangin.

Twelve Sky takes place in a world based on Middle Ages China.

[5] The newest Twelve Sky (12Sky) Private Server launched on May 1, 2023 boasting reduced ping for North American players and updated in game features from the original version.

Vortex Gaming has announced the grand reopening of 12Sky for the international English speaking community under the name of their project V-Sky.