Choi Minjung

In late 2019 to early 2020, Choi Minjung was added as one of the new members of the second generation of CoCo and was set to debut with the kids girl group with the digital single "Be Quiet". However, due to the COVID-19 pandemic, the official release of the single was delayed and released on November 11, 2020. Choi Minjung continues to remain an active member of CoCo as part of its newly formed third generation.

On December 6, 2020, CoCo released a profile for Minjung. On June 29, 2021, CoCo announced that it had terminated contracts with several members, including Minjung, who has now effectively left the group and agency.