The film is about the uncanny and veiled behaviors of the characters who are burning inside with what they cannot ask, say, hide, do and did not do. It is full of doubt, hesitation and possibilities. It's always a matter of being in-between, pride and passion, leaving and staying, saying/asking or keeping quiet.
ZD is in the classification of human behavioral scientist directors, meaning that's what he's worried about in his movies. That's why he senses human behaviours pretty well. The frame is another sucessful feature, most of the scenes are showed either through reflections or from behind the door (almost within the frame). In this sense, we can say that it has an expressive and impressive style. The weak point of the film is that it is unnecessarily long and the director's filmography unfortunately loses its originality gradually, even in itself, it falls into repetitions and does not leave room for the audience to breathe.
Still, he is a worthy director. Hoping to see his better movies.