Shin
The Shin were the gods of Korea, and resided in Shinshi, one of the God Realms, among the Inner Planes.
Hwanin was the Shin representative to the Council of Godheads.
In 1000 AD, the Third Host of the Celestials occurred, during which the Space Gods informed they would return 1,000 years later to judge Earth's right to continue existing. While Earth pantheons prepared for war, Gaea planned a peaceful solution to the problem with many goddesses, among them Ungnyeo of the Shin.