Monsta X (Hangul: 몬스타엑스; often stylized as MONSTA X) is a South Korean boy group formed by Starship Entertainment through the survival show No.Mercy on Mnet in 2015. The group is composed of seven members: Jooheon, Shownu, Kihyun, Hyungwon, Wonho, Minhyuk, and I.M.

The group debuted in May, 2015 with their first EP Trespass. In March 2017 Monsta X released their first studio album and final part of "The Clan" series, The Clan Pt. 2.5: The Final Chapter, which consist of their third and fourth extended play, The Clan Pt. 1 Lost and The Clan Pt. 2 Guilty, both released in 2016. In May 2017, Monsta X signed with Mercury Tokyo and debuted with the single "Hero" in Japan.


Source : wikipedia