Following the devastation of the 20th century's Second World War, Korea was divided into two countries—North Korea, which was backed by the Soviet Union and its allies, and South Korea, which was backed by the United States of America and its United Nations allies. From the years 1950 to 1953, North and South Korea fought in a conflict which would come to be known as the Korean War.
In 2376, Elias Vaughn had a second orb experience with a Bajoran orb. In this experience, Vaughn became Eli Underwood, a veteran of the Korean War. Underwood was present when the UN-allied forces retook Seoul. (DS9 novel: Unity)