There's this one song that plays for Yunhu and Gukhwa that I really like. It's not the one that the actress playing Gukhwa herself sings (the slow and fast version of the title song) but it's anothe female singer... I really love that song.
Today they were playing the extended version of the theme song while Yunhu and Gukhwa were ice skating. There was no dialogue at all other than their laughing, and I thought it would have been a nice time to sub title the lyrics since I would like knowing what she's singing. (It *does* sound like Gukhwa to me.)