On August 2 episode of JTBC's television show 'Sositamtam', Lee Soo-man made a surprise appearance.
In this episode, the head of their agency SM Entertainment Lee Soo-man sent a video message to Girls' Generation, congratulating them on welcoming the 15th debut anniversary.
Lee Soo-man said, "Congratulations on your 15th debut anniversary. In order to keep being the great artists you are now, you must act thoughtfully. Also, be humble. Love everyone at all times."
He continued, "Remember to always enjoy your performances as well; this is a must. You should feel grateful that a lot of people like you and your performances. Well done for the last 15 years."
He jokingly added, "How about you girls keep going for another 15 years?"

Sooyoung also said as if she was a little shocked, "15... 15 years?!"
But Yuri excitedly stated, "Let's do it!", which made Hyoyeon go, "Yes! For 15 more years!"
Then, all Girls' Generation members laughed out loud and nodded.

They resumed in a playful manner, "Although we no longer can keep our feet in the air like we used to back in the day, we would like to thank you for making it possible for us to be together again. Stay healthy!"

(SBS Star)