Basically, this is the story about a well-to-do Beijing businessman with questionable business principles who enjoys the company of young male students whom he treats as his play thing and pays them for their sexual participation.
Lan Yu a somewhat shy architectural student attending a University in Beijing is enticed into the businessman's home where he is subsequently seduced.
In the ensuing months the relationship deepens and they become lovers meeting at every opportunity. The emotions are subtly portrayed by the two actors. We hang on every word spoken and get caught up in their feelings. "We must never become too close", says the businessman. "It is right and proper for a man to have a wife and children". Such are his thoughts....
Secretive though their relationship may be, it is never sordid. They feel so relaxed in each other's company. The tiny rooms and narrow passageways are almost claustrophobic. Note the device of photographing reflections in mirrors so often throughout the film. An interesting technique which is constantly repeated. In a mirror you see a person lying in bed. Beyond the camera you hear a door closing. You know that some one has left the room, though you do not see it. And note the frequent use of close-ups so important in emotional scenes. A hug, a kiss, a sob, a tear....so meaningful...and each emotion tugs at your heart.
Shakespeare said "Parting is such sweet sorrow". Here we have such sorrow, but then the joy of re-uniting, followed alas! by a new tragedy that parts them once more.
The final scene when the businessman stops his car at the building site and then speeds on ever so quickly with the concrete pillars flashing by is a fitting ending in itself. I think the song detracts from the mood and would be better omitted.