The group consisted of seven members: Mayna, Nahyun, Hyeongshin, Dana, Yewon, Yebin, and Dain.

The group debuted on April 28, 2021, with their first extended play (EP), Issue Maker.

[3][4] Mayna was a contestant on the Chinese survival show, Produce 101 China, but was eliminated in episode 7 after being ranked 52.

[10] On April 22, 2022, after 4 months of no updates, S2 Entertainment announced that the group has officially disbanded, 6 days before their debut anniversary.

The decision was made after a long period of discussion about their future and direction of the group.