a long interview with the director in french (link)
if you understand the french, you shoud read this :
http://www.orient-extreme.net/index.php?menu=cinema&sub=artistes&article=170
I used google translate to read it, when they asked him if the actresses knew it was about lesbians he said (sorry about rough translation):
"They had no idea of homosexuality. They found it disgusting and hideous. They did not understand anything about the film before the premiere."
That has to be a joke? How else would they film the kissing and bath scene?!
Bath scene isn't so bad, since straight girls do that too.
As for the kiss scene, I can tell lee young-jin wasn't too comfortable with the whole thing. Lucky for her, her role, Shi-eun, was supposed to feel awkward about the kiss anyway. As for Hyo-shin, all I can say is, she's really professional.
And the original story looks interesting.