So I did Tae Kwon Do for a good portion of my childhood and I learned some things. Let's see if it helps you...
The dividing line is called the 'Division of Korea' and there IS a U.S policy on North Korea but I don't think that's what you're looking for. But if it is here's what I know..
North Korea's position focuses on three major themes: that the inter-Korean armed confrontation must first be ended; that North Korea's transitional scheme of coexistence called "confederation" be recognized as a practical necessity; and that a one-Korea policy should be pursued under all circumstances.
And as for South Korea, to my understanding it's the United Nations, but again, I'm unsure if this is what you need but here...
In response to the North Korean attack against South Korea on 25 June 1950, the United Nations Security Council (UNSC) established the UNC as a unified command under the US in UNSC Resolution 84 on 7 July 1950. The UNC mission was to assist South Korea to repel the attack and restore international peace and security in Korea.