The mystery white object floated into view as a passenger jet soared through the skies over South Korean capital Seoul at the weekend.
A quick-thinking passenger pointed his camera at it, watching as it appeared to change course and climb before shooting off.
The sighting was captured on Saturday and uploaded on YouTube by Crazybreakingnews who said: “It looks a little bit strange and not really similar to the other videos.
"If it's really real and not a fake, it looks like a kind of military drone."
To watch video, click http://www.thesun.co.uk/sol/homepage/video/virals/4250636/UFO-spotted-over-Seoul.html