A light flight to norh in straight and zigzag. Then disappeared.At that time the sun had fallen down. So it was dark. The UFO had a weak orange light. I felt it was far from me. Two airplanes flight over my head just before watching the UFO. The light which I observed was not airplane's light.Because that was very higher than other plane's flight course, and that went to north face. I had never watched a airplane facing to north.(We face to north Korea, so no airport exist in north and not allowed to flight to north) The light flight to north in a straight line for a minute. And then that flight like zigzag. After zigzag flight the light was dimished and disappeared.((NUFORC Note: Date is approximate. PD))