Basically, if you're an idiot, they're the people on the internet that try to aggravate you. This mostly happens to Justin Bieber fans, hornygirls and guys on omegle, and idiots in general. Either that, or the troll just has too much time on their hands and trolls any random person for shits and giggles.
A Sub-Unit of the 12 member girl group LOOΠΔ, that consists of five members. HaSeul(who is the leader of the Sub-Unit and the leader of LOOΠΔ), Hyunjin, Heejin,Vivi, and Yeojin. Their concept is about the excitements and expectations of first love.
LOONA 1/3 is a Sub-Unit of the 12 memeber girl group LOOΠΔ that consists of HaSeul , Hyunjin, Heejin, Vivi, and Yeojin.