i was kinda confused. den i found some explanations.
warning: the below is only for people who has seen jay chou's the secret. its to give a better understanding of the show and not call it lame ok. haha. -thats to u jlow. =P so its pretty much a spoiler la. ppl dont read if u don't like spoilers. haha.
Rain can only be seen by the first person she sees when she goes into the future - Hence the line "At first sight marks one's destiny" - As well as her closing her eyes and taking 108 steps to Jay's classroom.
that explains why the sweeper can see rain. because when rain went back, she forgot to close her eyes and she saw the sweeper instead of jay. that's why when jay look for her, he couldn't find her...well. maybe u guys already figured it out yourself. but cos the version that i watched, the quality quite bad, so the show very blur and dark. haha. so i cannot see properly. ok - excuses, excuses. ya la! i so cant figure it out. lol.
but but but right, i thought Rain was already dead by the time he went back? Then why is Rain still sitting there smiling?
and and and apparently the piano would be destroyed the moment jay finishes playing the piece in 1999 and enter 1979. so he would be stuck in 1979 and be a 'walking soul' of 1979 and his body would be dead in 1999 right? considering if only the soul would fly over? hahahahaha.
hmmmmm. ok. may the show is kinda lame afterall. someone please explain it to me. hahaha.