>>2 Well, the thing is that it doesn't have a proper "plot". It is very ambiguous and the film doesn't actually finish. It simply explores the psyche and relationships of several women with the protagonist (Tony Leung).
For it to make more sense I would recommend watching first In The Mood For Love.
What I can do at least is give a link to the trailer:
https://m.youtube.com/watch?v=vfNe3zFT9rk