Not to be confused with Best Korea, Good Korea (or combined as one word is Gorea) is an American colony much like Puerto Rico. This is not ironic or in any way in line with ED, it's a just a fact missing from Wikipedia: South Korea is no more sovereign than Puerto Rico. Their army is directly under command of the American Army and their first president was an American Hawaiian military dictator.
Good Korea was one of the United States' 20th century acquisitions in accordance with the long-term Manifest Destiny.