AOA's Yuna has a younger sister, Seoyool, who will be making her debut in the music industry as a member of Berry Good.

On January 23, a photo of Yuna and her sister was posted onto Berry Good's Official Facebook page.  Beneath the photo, it says, "A shot with my sister, Yuna, who is actively working as a member of AOA! Do we look similar?"

This was posted before Asia Bridge Entertainment made the announcement.

The group, Berry Good, has already been active and is now getting ready for their second album, which will be released next month.

On the banner of Berry Good's Facebook page, it is hinted that there will be two other members that will be introduced.  Three of the original members left the group, but Taeha and Gowoon remained.

Asia Bridge Entertainment calls Seoyool "charming."