Lesbian couple Sua and Ryunhwa separate when Sua is 19. Reuniting after a decade, Ryunhwa requests Sua to be her surrogate mother, which Sua accepts.

A Song of A Girl follows 19 year old Sua, who is told by her lesbian lover, Ryunhwa, that she is leaving. Ten years later, Ryunhwa contacts Sua again. While meeting with her ex-lover Sua, Ryunhwa asks her to be her surrogate. Sua accepts.—Sung-Hwan Kim