ATBO (에이티비오, stands for "At The Beginning of Originality") was a six-member boy group under IST Entertainment, formed through the survival show "The Origin – A, B, Or What?". The group consisted of Oh Junseok, Ryu Junmin, Bae Hyunjun, Jeong Seunghwan, Kim Yeonkyu and Won Bin. Seok Rakwon left the group on May 06, 2024. They debuted on July 27, 2022 with the mini album "The Beginning : 開花" with "Monochrome (Color)" as the title track. Read more on Last.fm