hmm... this is how i feel... since so many ppl said liao.. so
hope i m not spoiler.. jz wan to say how i interpreted the movie..
haha
but bbb & me think totally differently.. maybe i m the only one
who think tat way.... 
"return home with hasty key" == when they want to go back to their
"home" (for jay: current time, for rain: past), then they played
with hasty key.
but at the last scene.. when jay wan to go back to the past &
find rain, he played hasty key, thus he din go back to the past to
find rain.. instead, he remain at his current time. end up, he kana
hit & died..
i feel that rain has aldy died of asthma attack when she is writing
on the table, using liquid paper.
so.. when jay saw rain in the last part... both of them has
died...
