Infinite( Korean :인피니트) is a seven-member South Korean pop boy band , formed in 2010 by Woollim Entertainment . The group comprises seven members: Sungkyu , Dongwoo , Woohyun , Hoya , Sungyeol , L , and Sungjong . Their most recent mini-album, New Challenge , has sold over 160,000 copies in Korea alone and was one of the best-selling albums of 2013. On 21 May 2014, they released their second full album " Season 2 ",following up with a repackaged album, titled "Be Back", on July 22, with title track " Back " which features an orchestral mix of Ballad & Dance. The single has garnered much attention for its outstanding musicality.Prior to their debut, the group was introduced to the public through the Mnet reality show "You're my Oppa", alongside labelmate Lovelyz member, Yoo Jiae .