Watch: South Korea battles 'lovebug' invasion

First identified in South Korea a decade ago, Seoul is now annually hit by a weeks-long infestation of the Plecia nearctica insect, a type of March fly nicknamed "lovebug" for their distinctive mating behaviour, which sees them fly around in coupled pairs.

Huge clouds of the insects, which are harmless to humans, blanket apartment walls and mountain trails and, after they quickly die, leave behind piles of rotting black remains and a foul stench.