One of my fave Kdrama is Princess Hours...I've watched it more than 10x already and just watching all these OSTs makes me want to watch it again...
Perhaps Love/ Sarang In Ga Yo/ Is It Love?
video uploaded by jstasimplegrl
And look what I found, a Tagalog version!
video uploaded by popangel94
Can't help posting this background OST as well
video uploaded by CXTN