There's a specific DBSK fanfic that I read on Winglin in 2009. I've tried asking people on several sites if they know it but they can't help. Maybe I'll leave it on here and maybe someone can tell me the title of the fanfic or author? Or even if the story is on Asianfanfics.

From what I remember, it was based on Yunho and an OC character who he was planning to marry. Then there was an accident and she died but she was given a chance by the heavens to be transferred to a new body. She has a  limit of a year (I think) to make Yunho fall in love with her without realising it's really her. Eventually, the other DBSK members realise who she is by her actions etc. and Jaejoong ends up falling for her realising who she is. During the end, I recall Jaejoong saving her from falling off a roof and becoming an angel watching over Yunho and this girl in the future.

I may update this bit by bit in more detail but if anyone can remember that would be good.