Super Junior's Yesung contributes to That Winter, the Wind Blows' promising OST with a pop ballad, called "Gray Paper." The producer of the anticipated drama, Kangta, penned the lyrics that portray the sad love between Jo In Sung and Song Hye Gyo's characters. The song is also one of the main theme songs for the drama. While Yesung has quite an impressive record of singing for dramas, this is Kangta's first OST production. If you like it, you're in luck, because you'll be hearing it a lot very soon! The drama will premiere in time for Valentine's Day! You can subscribe for episode alerts here. What do you think of the song?