On September 1, the group returned with their second extended play titled Rush.
The title track of the same name is described as a song representing the signature style of the group, produced by Giriboy. Keone Madrid choreographed the dance and Joo Hee-sun directed the music video.
Rush contains six tracks produced by Mad Clown, Crybaby and Rhymer. Jooheon also took part in rap making for five out of the six tracks, while fellow member I.M was involved in four songs, including the title track "Rush".
Monsta X also performed at the KCON 2015 in Los Angeles making it their first U.S. appearance and performance. Monsta X received the Next Generation Asian Artist award at 2015 and the 1theK Performance Award at 2015 .
Track list:
01. Rush
02. Hero
03. Perfect Girl
04. Amen
05. Gone Bad
06. Broken Heart
