Korea has a long history of UFO sightings. During the Korean War, both American and Korean pilots reported encounters with UFOs.
In March 1979, two Korean Air Force pilots participating in the Team Spirit joint military exercise reported seeing a very bright, lighted plane. Nothing appeared on their radar screens.
The pilots alleged that the ship had flashing lights on the sides and what looked like a burning furnace in the middle. It then reportedly shot sideways, stopped, and then moved rapidly upwards and out of sight.