Originally Posted by
Meari
During the group's promotions, members Jessica, Tiffany and Seohyun were featured on a mini-album released by Roommate, a one-man band from Purple Communication. The mini-album was titled Roommate: Emotional Band Aid, and was released on December 1, 2008. The song performed by the three girls, titled "Oppa Nappa" (*빠 나빠; literally, Bad Brother), was digitally released before the album in April 2008. The song was performed live on SBS Inkigayo, KBS Music Bank, and M! Countdown
I don't own it, maybe it was just released as a limited edition or something.