Eunjun

Eunjun was originally expected to debut in SPECTRUM in October 2017, however, the group's debut was postponed due to the members' participation in MIXNINE. On May 9, 2018, SPECTRUM released their first mini album Be Born and officially debuted on May 10 through their debut stage on M Countdown. On July 10, 2020, WYNN Entertainment announced that the group disbanded and the members' contracts were terminated due to the company's struggles.

On April 14, 2022, Eunjun was introduced as one of the members of the trainee group B3o1z (later known as AIMERS), under B301 Entertainment. They debuted on November 17, 2022 with the mini album Stage 0. Betting Starts.