Kim Jae-pil, who participated in the Korean War as a member of the North Korean People's Army, saved the life of Ward Miller, a U.S. fighter pilot who was the enemy. The two hid in the mountains and shared life, death and friendship for 15 days. Finally, they were rescued by a U.S. military helicopter. Ward Millar was repatriated to the United States and Kim Jae-pil was sent by the U.S. military to the U.N. as a prisoner of war as he was dressed as a member of the North Korean People's Army. Ward Miller, who returned to the U.S. at the end of the war, found Kim Jae-pil and sent him a letter. Kim Jae-pil and Ward Millar exchanged letters in Korea and the U.S. respectively and shared deep friendships, but at some point, their letters were cut off for unknown reasons.