IST Entertainment's rookie boy group ATBO has unveiled the full concept trailer for their debut mini album, 'The Beginning: 開花 (Gaehwa)'. 

The full concept trailer for ATBO's debut mini album introduces fans to the boy group's unique storyline, which centers around seven young adults who dream of a world full of color, hope, and creativity. Keywords signaling the beginning of ATBO's universe include "darkness", "light", "color", etc. 

Meanwhile, the 7-member rookie boy group ATBO is set to debut on July 27 at 6 PM KST with 'The Beginning: 開花 (Gaehwa)'.