Korean fighter jet flanked by disc shaped objectLunch time in Korea is a busy time for jets flying overhead, usually they are quite high in the sky, loud, so you can here them but difficult to see especially on a cloudless day as the sun is so intense.This one day in the early part of this year,(can’t remember if it was January or February now) I heard a jet but it sounded a lot louder and lower so I looked out my bedroom window.My bedroom window is east facing. At first I saw the fighter jet, flying very low, so as detail could be seen on the vehicle, and almost immediately after, saw a disk shaped object pacing behind it, in the jets right flanked position. The jet was flying from west to east approximately. I remember clearly that the jet had a heavy jet stream flowing behind it but this disk object had no jet stream. The speed of the disk matched the speed of the jet exactly as if linked by a cord.