The group consists of eight members: DK, Louis, Donghyuk, Siwoo, Mikey, U, Sungjun, and Sodam.
Originally a nine-member lineup, Youngbin departed from the group on February 25, 2023, due to dating violence allegations.
The group made their official debut on May 24, 2022, with their first EP titled K2Y I : Confidence [Thumbs Up].
[15] On February 25, 2023, an anonymous individual came forward accusing idol "Y" of dating violence, who was later confirmed to be Youngbin.
Later that day, Keystone Entertainment confirmed the rumors, and announced that Youngbin had left Blank2y and the group will reorganize as eight members.