Sunny also celebrates, ”not participating but composited”! ”Girls' Generation”, friendship remains unchanged even on the 17th anniversary of their debut... Is Seohyun in ”informal speech” mode?

The group Girls' Generation boasted of their unchanging friendship for 17 years.
Girls' Generation, who first appeared on the music industry with the release of "World", is now celebrating its 17th anniversary since their debut.
In response, at midnight on the 5th, member YURI posted a video of a party featuring members of Girls' Generation who gathered to celebrate the group's 17th anniversary on her YouTube channel.
In the video, Tiffany rented a room and prepared a party for her birthday and the 17th anniversary of Girls' Generation's debut.
All members except Tae Yeon, TIFFANY, Hyo Yeon, YURI, Suyeong, Yuna, and Seohyun came together dressed in matching dress codes to commemorate the special day.
On the 4th, Yuna posted a group photo taken on the day on her personal channel, celebrating her 17th debut anniversary.
The group shot of the eight members was composed in a single image, which made fans laugh. Yuna also posted the following message: "Girls' Generation 17th Debut
Hyo Yeon also posted a group photo on her personal channel, saying, "Congratulations on the 17th anniversary of Girls' Generation. SONE (fandom name) is always with us."
Thank you for being with us." Tiffany also posted a message to celebrate, with Suyeong writing, "Seohyun, from today onwards, I will be with you, my sisters.
I decided to talk to you. Seung-gyu (Sunny's real name), I miss you," he said, announcing that for the first time in about 23 years, Seohyun would be in "informal speech" mode. In response, Seohyun said,
"Yes. I decided to talk to you in a casual manner," he replied, drawing laughter. Sunny, who was unable to attend the 17th anniversary party, posted a photo of herself on the 5th afternoon.
Alongside the group photo, he wrote, "Unfortunately we couldn't be together physically as we were on the other side of the Pacific Ocean, but thanks to Seohyun who skillfully completed the composition like this, we had a great day together through photos!
" Sunny also expressed her gratitude to the members and fans. "Everyone, this is already our anniversary! Let's continue to have fun! Now we are "Girls' Generation", this
"Girls' Generation from now on, Girls' Generation forever. It's fun to be together even in the photo shoot, Sunny," she added, expressing her feelings.