Youn Junghoon as a guest in Invincible Youth episode 18 (Feb 2010). Junghoon came as a guest for his friend g.o.d Kim Tae woo and he came straight after his filming schedule for drama 'Jejungwon'. <br /> <br />#연정훈 #yeonjunghoon #younjunghoon <br />#invincibleyouth
