EXIT : E is the first extended play by a South Korean boy group that was originally what?
Exit : E: EXIT : E is the first extended play, and the second musical release of South Korean group Winner. Winner (band): Winner (Hangul: 위너), often stylized as WINNER, is a South Korean boy group formed in 2013 by YG Entertainment and debuted in 2014. Winner (band):  Originally a five-piece group with Taehyun, who later departed from the group in November 2016.
a five-piece group