She first contributed her vocals to "7989" (featuring Kangta), a track taken from both Girls' Generation's eponymous debut album (2007) and Kangta's fourth studio album, Eternity (2008).
Ia pertama kali menyumbangkan suaranya untuk “7989” (menampilkan Kangta), sebuah lagu yang diambil dari album debut eponim Girls' Generation (2007) dan album studio keempat Kangta, Eternity (2008).