Looks staged as the a/c is hardly damaged. The MiG-21 has a landing speed of ~180mph.
That's my bet, something doesn't add up. Plane is way too intact... (then again this thing was outa gas.. also didn't seem to be carrying any ord... how slow can a stripped and empty MiG-21 go?) + crashing next to a populated area + no survivor. Obviously ran outa fuel due to lack of fire, but it doesn't seem to of had any ordnance on it either, so maybe a training flight of some form? Do N.Korean MiG-21s have ejection seats or parachutes for hteir pilots?
I have this picture in my head of a young, desperate/hungry and inovative North Korean pilot who must of somehow put more value in defecting in whole with his over-prized outdated Russian MiG than bailing on it because he opted to ride it down into the corn field rather than just ejecting out (so assuming that even though he didn't agree with most of his leader's propaganda, he obviously believed the bits about how badarse his MiG-21 is compared to what the rest of the world has at their disposal).