According to an insider on April 7, the solo artist has joined Woollim Entertainment, which also houses acts like Nell, INFINITE, and Lovelyz. A rep from the label said, "JOO and we have decided to join together for the future. There was no particular connection, but we believe she has a lot of potential and came to this good conclusion after a meeting with her."
JOO became a trainee at JYP Entertainment after her appearance on the SBS show 'Superstar Survival' in 2006 and debuted in 2008 with 'Young Girl'.