| Title | Singer | Writer | Album |
|---|---|---|---|
| If you love me (japanese version) | Yoon Gun | Chuyện Tình Buồn / Sad Sonata OST | |
| If you love me (music box ver.) | Yoon Gun | Sad Sonata OST | |
| No matter how many times we part (japanese version) | Yoon Gun | Chuyện Tình Buồn / Sad Sonata OST |