On December 2015, Cube Entertainment announced that they are preparing to debut a boy group in mid-2016, 4 years after BTOB’s debut. The first group trailer “Come Into The World” was revealed on April 26 featuring 10 members. The 10 members are revealed to be Jinho, Hui, Hongseok, E’Dawn, Shinwon, Yeo One, Yan An, Yuto, Kino and Wooseok.
It was later confirmed that the 10 members featured on the teaser will be competing on “Pentagon Maker”. The program will be aired online through Mnet’s digital content brand, M2 every Monday and Tuesday starting on May 2. The program will showcase the 10 members, challenging five aspects: Performance, Dance, Teamwork, Talent, and Mind. The trainees will be given missions and may work individually or as a team. The final members will be determined through video likes. They held their first public performance at West Bridge Live Hall in Hongdae on May 21, 2016. On July 9, Pentagon released the collaboration songs, “Young” (prod. by Dok2) and “Find Me” (prod. by Tiger JK). A music video for “Young” featuring the winning members, Hui, Yeo One, Kino, Wooseok and Yuto, is also released.
Pentagon was originally scheduled to host their debut concert on June 23, 2016 at Jamsil Indoor Stadium, but Cube Entertainment revealed that the concert and debut date of the group might get delayed because of some internal issues