Charlie Simpson and Yang Seung-ho are both in musical groups consistiing entirely of which sex?
Charlie Simpson:  AllMusic has noted that Simpson is "perhaps the only pop star to make the convincing transition from fresh-faced boy bander to authentic hard rock frontman". Yang Seung-ho: Yang Seung-ho (양승호; born October 16, 1987), is a South Korean idol singer, dancer, actor, model and the leader of Korean male group MBLAQ, currently active in South Korea under Will Entertainment.
male