Krystal made a new Instagram post to support Jessica's solo debut.
On May 17th, Krystal uploaded a new photo on her Instagram and wrote, "my sis is flying #FLY."
The photo shows Krystal and Jessica posing together for a photo, and the two girls are tightly hugging each other in the photo.
Jessica's first solo debut title track, 'FLY,' is a song with Jessica's soothing vocals and catchy melody lines.
Meanwhile, Jessica's first solo album, 'With Love, J,' was officially released on May 17th.