Jaeeun

On July 30, Jaeeun was introduced as the secret member of I. O Entertainment's upcoming girl group Rhea. As Rhea will be a group inspired by Greek mythology, all of the members were given a goddess name that represents their personality.

Jaeeun was given the name Selene, after the goddess of the moon. The group made their debut on October 1, 2021 with the digital single "Time Travel".