Eunha

She debuted as a member of GFRIEND on January 16, 2015 with the group's first mini album Season of Glass. On May 18, Source Music was announced that all members of GFRIEND, including Eunha, have decided to not renew their contracts with the agency. They went on an indefinite hiatus on May 22 after the end of their exclusive six-year contract.

On October 6, she announced on her personal Instagram that she will be joining Big Planet Made with SinB and Umji. BPM Entertainment later confirmed that the three members have signed an exclusive contract with the agency and are planning to re-debut as a three-member group. On October 8, it was revealed that the group name will be VIVIZ.