Kim Jae Kyung

Jaekyung debuted as a member of Rainbow on November 14, 2009 with the group's first mini album Gossip Girl. On January 20, 2014, she debuted as a member of Rainbow's second sub-unit, Rainbow Blaxx, with the special album RB Blaxx. On October 28, 2016, DSP Media announced that Rainbow would be disbanding after seven years of activities after all of the members decided not to renew their contracts with the agency.

On December 20, Namoo Actors announced Jaekyung had signed on with the agency, where she would be focusing on her acting career. In 2019, Rainbow reformed to celebrate their tenth-anniversary since debut with the special single "Over The Rainbow".