It's an old one in cantonese I think. So what happens is this man and woman both have amnesia, the reasons is because some years ago they met and fell in love. The woman is cupid so she can't fall in love which is why they both forgot each other. They fell in love again but they parted at the end. The guy watched some fireworks while the rain falls from the sky, that's the cupid girl's tears and it ends with a paper taketombo falling into the ground. Such a great film but I just can't find the title.