Her label revealed, "Chanmi, NuA, Sooha, and Darin will be debuting as the four-member group High Color." The four girls will also be on Yang Hyun Suk's audition show 'Mix Nine', where they will be showing off their unique charms before they debut together.
Chanmi was originally a trainee at SM Entertainment alongside Girls' Generation. After she left the label, she joined MBK Entertainment and became a member of Co-ed School and 5dolls, but ultimately returned to being a trainee when the groups disbanded. She was also on 'Produce 101' season 1 but didn't make the cut at rank 26.