A day before the release of song 'Twinkle' from their unit album, Tae Yeon and Tiffany made a surprise advertisement.
On SM's official Facebook page, a photo of Tae Yeon holding a 'Twinkle' sign and staring at the camera was revealed. Although Tae Yeon has been looking tired with the missing of her cheek fat, she showed enthusiasm for her 'Twinkle' promotion a day before its release.
Tiffany wearing a hood and holding a cue card, "Everyone, if you wait just a little more, 'Twinkle' of Girls' Generation's Tae Ti Seo will be revealed. On the 29th at midnight. Please anticipate for us."
As soon as Tae Ti Seo's teaser video was revealed, it placed first on YouTube's homepage as the most viewed video, and made us realize the magnitude of Girl's Generation's popularity.