1) Because I Miss You
2) You've Fallen For Me
3) The Day We Fall In Love
4) Comfort Song
5) Though We Are Only Friends
How much more romantic can this song be. It's originally sung and performed by CNBlue's, Jung Yonghwa. If I've not mistaken, the song was played in episode 13, where he sung it over the phone to comfort Lee Shin. Yes, over the phone!!! AWW!
PS: Do leave a comment, just a short one will do, if you like the song. =P Thanks!