i got so excited when i saw jinhwan's face omg i'm currently working on him so again this is a super weak bio and prone to changes, BUT i think joon-ho is probably going to be 20 and from a very rough, neglectful family. he sort of bounced around from friend's couch to friend's couch for a while but finally finished school with really amazing grades, but for some reason can't live up to his potential?? he really needs someone to push him forward but he's kind of a stubborn little brat! i'm not sure of his occupation at the moment but it'll come to me eventually. ye-jun is so accomplished for being so young that he would probably look up to him and maybe it'll spark something inside of him to finally get up off his ass and do something with his talents!