Brown Eyed Girls' Ga-In has finally returned with a special new digital single for her fans titled 'Nostalgia' as a gift of gratitude for her fans.

Released online on the morning of November 30th, the song is the work of composer Kim Do Hyun and lyricist Park Seung Chul that expresses the thoughts one goes through as they develop feelings for their true love. The jazzy song features acoustic sounds that mesh beautifully with Ga-In's soft vocals.

Shinhwa's leader Eric also makes a rap featuring that creates the perfect harmony with his masculine tone, adding dimension to the plot of the song.

Also released with the digital single includes unreleased cuts from the music video. Loen Entertainment stated, "A fairy tale-like music video featuring Ga-In's innocent image has been completed with her song. Please look forward to it."

Check out the shorter MV released and the full audio below!