I'm looking for a relatively old, unfinished, chaptered fic where Jaejoong somehow ended up going back in time or in an alternative universe. He's stuck there as a student, trying to talk to Yunho. I think Yunho was a swimmer and would alternate between being friends with Jaejoong and ignoring him. Jaejoong somehow becomes convinced that he has to create another DBSK in this world in order to get back to his old place.
I'm not sure if those are the right details, but the fic was pretty old. It was written before DBSK broke up, but posted on LiveJournal. I don't know if it was ever finished; the last time I saw an update from the author, the author had mentioned something about getting sick. So I remember being slightly worried.
- !search, possible [YunJae] time travel/alternate universe fic