Their name is short for "ABSOLUTE SIX", meaning that the full line-up of BRANDNEWBOYS achieve absolute perfection when the five members and the fandom are together. Their name is also an abbreviation of "ABOVE BRANDNEW SIX" which reflects the hopes that the five members and their fans will open up new horizons for Brand New Music.
|Lim Young Min (임영민)||Leader, Lead Rapper, Vocalist||2019–present|
|Jeon Woong (전웅)||Main Vocalist, Lead Dancer||2019–present|
|Kim Dong Hyun (김동현)||Lead Vocalist, Visual||2019–present|
|Park Woo Jin (박우진)||Main Rapper, Main Dancer, Vocalist||2019–present|
|Lee Dae Hwi (이대휘)||Lead Dancer, Lead Vocalist, Maknae||2019–present|
- 6ixense (2019)
- B:Complete (2019)
- 5nally (2020)
- Acwell (2019)
- Young Min, Dong Hyun, Woo Jin and Dae Hwi were contestants on Mnet's boy group survival show Produce 101 Season 2. Woo Jin and Dae Hwi finished in 6th and 3rd place, respectively, thus debuting in the project group Wanna One. Young Min and Dong Hyun were eliminated and finished in 15th and 28th place, respectively.
- Young Min and Dong Hyun are also members of Starship Entertainment and Brand New Music's collaboration project group YDPP.