The hottest guy on the planet. Typically seen brooding and staring out of windows, the Joonsung is quite handsome. The Joonsung is also typically a dumbass.
"Why are you chewing on your pencil? You're being such a Joonsung."
Boys who enjoy yaoi (a genre in Japan that contains sexual and/or romantic relations between two men); literally translates to "rotten boy"; corresponding female : fujoshi