Update with purchase links:
Original article from 09/05/12:
Girls’ Generation’s Jessica is set to contribute to the OST of “The Great King’s Dream”, a historical drama starring Choi Soojong and airing Saturdays and Sundays on KBS. Her track for the OST, “Heart Road”, was a collaboration between composer Kim Junbum and musical director Lee Changhee, who previously worked together for Taeyeon’s very first solo OST, “If”. The song will be released on September 7th at 12 PM noon.
“Heart Road” is the latest of several OST songs from Girls’ Generation. In addition to “Heart Road”, Jessica also contributed to the soundtrack of “To The Beautiful You” with her sister, f(x)’s Krystal, while Sunny and Tiffany sang duets of their own for the drama with f(x)’s Luna and Super Junior’s Kyuhyun, respectively. Finally, Taeyeon will be releasing “Close” for “To The Beautiful You” later today.