[...] Wong had his own rationale for the emotional relationships in the film:

It’s very difficult to describe why a man likes a woman, and the deep feelings
between two brothers, and so on. They are all very subtle. But I wanted to put
forward the proposition that time is the biggest factor. The relationship between
people is like opening a calendar. You leave your trace on each day. Emotions
come without your being aware of them. I don’t know why I want to help you,
but I’ve done it. (my emphasis)