The seed of the grand tragedy, the Cheju Massacres (1947-1954) were crawling about to pop. Is it the path of unification and peace? Is it the road to division or war? Koreans were wandering in front of a forked road. The date of April 5, 1948, after the very day of Cheju April 3rd, 1948 Popular Uprising, the Commander of the United States Army Command in Korea, General Hodge issued a decree on human rights.” However, the U.S. military did not abide by any decree on human rights in the three years of US occupation in South Korea. The U.S. Army military officers who had been sent to Cheju from the main land, South Korea in the date of March 1st, 1947, to order, command, control and communicate the uncompromising hard-line anticommunist operation continued until the Cheju people were considered enemies and were destroyed in accordance with the Field Manual of US Army. So they did not distinguish civilians from guerrillas, and did not distinguish the armed forces of the guerillas from the unarmed refugees, innocent ordinary people. It was only a plan and implementation of a super hard-line suppression operation. It is the biggest reason that the U.S. military should be responsible for the Cheju massacres.