Yoona sings "Amazing Grace" with her feminine, delicate voice, portraying her character's personality perfectly! 

SEE ALSO: The Reign of Girls Generation's YoonA in Endorsements: The CF Queen

"Sometime" was also released today. Sung by Yoo Sung Eun, it is Yoona's title song in the drama, and it beautifully portrays the character in the show.

Check out the songs!