1TEAM Are A 5 Member Boy Group That Debuted On March 27 2018. The Group Consists Of Leader Rubin BC Jinwoo Jehyun And Junghoon. Rubin And BC Previously Participated In MNET's BOYS24 In 2016 And YG's MIXNINE In 2017. Sungho Made The BOYS24 Final Lineup But Left Prior To The Group's Debut Due To Musical Differences. Rubin Made The MIXNINE Final Lineup But The Group's Debut Was Later Canceled Due To Contract Disagreements With The Companies.