Anna's relationship with her brother was a little deformed, because her brother's death had been traumatized, and she seemed to have no father since she was a child. So in the dinner table scene, her mother says that Martyn is a lot like her brother, and Peter goes on to say that Martyn can give her a sense of security and peace of mind, which isn't entirely true. The double absence of father and brother makes Stephen and Martyn the reason. Martyn is like a brother, and Stephen is a father and a lover to her. She couldn't live with Stephen alone, because she also needed someone like Martyn as an older brother, but she needed Stephen to maintain such a dual identity. Stephen's background shows that his marriage to his wife is dominated by political factors. Through his powerful father, the wife knows every nuance of her husband's political life, and Stephen lives a step-by-step middle- and upper-class life. Maybe he has a desire to break free, but this desire is hidden deep enough and ruthless enough, so he has been lurking under the water for so many years, calm and peaceful. But Anna happens to be a person who survived the damage. She has a tendency to self-destruction and has no concerns of ordinary people. So her self-destructive tendencies attracted him and became an outlet for his torrent of desires. Those weird positions are highlighting their obsession with each other, obsession. The wife's breathless outburst at the end and the subsequent remarks that her favorite is Martyn shows that she and her husband have long since separated, and that offspring have become the only bond that holds the family together. Although this situation is common, it is not surprising that it has been described in many literary and film works. But the consequences of derailment may be just a scandal, or cover up, everyone cheerfully pretending to be normal in front of everyone (a very inappropriate example is the Prime Minister and his wife in the first episode of Black Mirror), or divorce. If there were no "saboteurs" like Anna, who were desperate to fly into the flames, it would not have caused such serious consequences. At the end of Stephen's narration, there is a kind of vicissitudes of sadness, she survived, now having a normal life, but he has to suffer, forever.
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