The single from the mini-album/ digital album “Roommate” by So Nyeo Shi Dae’s Jessica, Tiffany, and Seohyun. It was released in May 2008. The song is about a dongsaeng’s (younger sister) unrequited love for her oppa (literally “older brother”, but implied “older male boyfriend”). The music is a bit emotional but still light, dealing with the typical young love. I love it because the sound seems to rely heavily on the melody of the vocals, rather than on instruments. The girls in fact have beautiful voices, so this track really deserves checking out.