Byeolha

On July 28, Byeolha was introduced as a 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.

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