U.S. Security Council
The efforts of the UN Security Council in regards to Korea were to help out on side of South Korea and to encourage North Korea to back off some land, and move back. The UN Security Council also assisted South Korea because North Korea had broken its peace with them. Security Council Resolution 83 was adopted to help bring peace to the Republic of Korea (ROC).
"To repel the armed attack and to restore international peace and security to the area" - Said About :Security Council Resolution 83
"Having called upon the authorities in North Korea to withdraw forthwith their armed forces to the 38th parallel," - Security Council Resolution 83
Later on, Security Council Resolution 84 had been created and recommended that the members providing military forces and other assistance to/in South Korea to make those forces available to a combined command under the U.S.
The role of the UN Security Council was major in helping South Korea with North Korea, it had helped assist them when North Korea had broken their peace and attacked. Also they had created forces there, gathering help from their nations such as the U.S.