IST Entertainment's rookie boy group ATBO has revealed heartthrob debut teaser photos of today's members Seunghwan, Yeonkyu, and Won Bin.

Following teaser photos of Junseok, Junmin, Hyunjun, and Rakwon yesterday, the boy group has now completed its first individual concept photo series with today's three members. 

Originally selected from the Kakao TV survival program 'The Origin', ATBO will be debuting soon with the release of their 1st mini album, 'The Beginning : 開花 (Gaehwa)', on July 27 at 6 PM KST.

Get to know ATBO's Seunghwan, Yeonkyu, and Won Bin in their debut teaser photos, below.