[All] Seohyun speaking informally to her sisters for the first time in 23 yearsㅋㅋ

17th anniversary? Seohyun from now on

I decided to speak informally to the Girls' Generation sisters ㅋㅋ

Oh my gosh, it's so cuteㅜㅜ

It's still a little awkward, but I'll try my best😍