History of South Korea
On August 15, 1948, the Republic of Korea was formally established, with Rhee Syngman as the first president. With the establishment of Rhee's government, de jure sovereignty also passed into the new government. On September 9, 1948, a communist regime, the Democratic People's Republic of Korea (North Korea), was proclaimed under Kim Il-sung. However, on December 12, 1948, by its resolution 195 in the Third General Assembly, the United Nations recognized the Republic of Korea as the sole legal government of Korea.
Constitution of South Korea
The Constitution declares South Korea a "democratic republic" (taken from Article 1 of Constitutional Charter of the Provisional Government of the Republic of Korea of 1919), its territory consisting of "the Korean Peninsula and its adjacent islands," and that "The Republic of Korea shall seek unification and shall formulate and carry out a policy of peaceful unification based on the principles of freedom and democracy." There are disputes over what "freedom and democracy" mean in Korea, but the direct translation of the Korean word used in the constitution (자유민주적 기본질서) would be liberal democracy.