Kim Haeri

After being introduced as a member of LIPBUBBLE, Ella made her debut in the group on September 7, 2018 with the group's second digital single "Yellow Pink". She left the group in March 2019. Shortly after leaving the group, she joined the cheerleading team TWINKLE with former LIPBUBBLE member Lia.

In July 2020, it was announced that Ella is planning to debut as a soloist in August of the same year with a dance track, presumably under the same label as Lia. After some postponement, Haeri made her solo debut on October 6, with the digital single "OOTD", the track featured Sujin of the musical duo PAXCHILD.