There are a couple of them, sorry!
I read a lot of fics at this one forum, but it sort of closed down, and I don't remember the authors much. =(
Okay, one was a shinhwa one about a girl named Kei (I think) and she moves in to an apartment and meets Hye Sung, who is her roommate's friend and he's really rude. And her roommate starts dating Min Woo, who has a bad past with Kei... I'm not making any sense, am I? :: sigh ::
Um, the other one's about this girl named Ji Hae and I think she moves into a haunted apartment(?) with Jong Hyuk as the ghost... she lives next to Ho Suk and she doesn't know that Jong Hyuk lives with her... I'm still not making any sense, am I? :: bigger sigh ::
Sorry to bother you, XP