I.O.I and DIA’s Jung Chaeyeon shared a sweet video of I.O.I being so happy to greet their fans as a whole group!

May 4 is the 2nd anniversary of I.O.I’s debut, after the 11-member project group was formed through the first season of “Produce 101” in 2016. I.O.I promoted for several months before disbanding at the end of January 2017, with the members returning to activities with their agencies and groups.

To celebrate their anniversary, Jung Chaeyeon posted a video of the members saying their greeting to fans. She wrote in the hashtags, “2nd Anniversary,” “Congrats,” and “‘Yes! I love it, we’re I.O.I’ for the first time in a while.”

Chungha also posted a collage of the group’s time together and shared her congratulations and love.

Fans are theorizing that the video was taken backstage during the group’s recent reported reunion for the filming of Mnet’s “Produce 48.” The show is a collaboration between “Produce 101” and Japan’s AKB48 system, with female trainees from both Korea and Japan taking part in the competition. “Produce 48” will be premiering in June.