ATBO has released a dramatic concept trailer preview and additional teaser photos for their debut album, 'The Beginning : 開花'.

The concept trailer preview introduces each of the ATBO members one by one in mysterious settings. Some are sitting in dark rooms while others look up at the sky or receive a signal in the middle of a part-time job. 

In their new teaser photos, the members of ATBO show a fresh vibe in tones of yellow. The members also demonstrate their chic chemistry in unit teaser photos.

The boy group's debut with the release of their 1st mini album 'The Beginning : 開花' is scheduled for July 27 at 6 PM KST.