There are only two kinds of people in the world, those who seek pleasure and those who avoid pain.
The policeman said he was in the latter category because he had a sick wife and he was suffering but was afraid that the pain would leave him. In fact, he is no longer in pain. Instead, he enjoys watching a video for his sick wife, watching with her, while eating, and telling others about it to satisfy himself.
The female protagonist saw the murder of the male protagonist. In the pain, she saw tenderness and relief, and hoped that she would be treated the same. Therefore, she wanted to meet the male protagonist, but the first meeting failed to attract him. A few years later, after the male protagonist was released, the female protagonist went there again, hoping that the other party would fall in love with her and be treated with the same tenderness. As a result, the male protagonist gradually changed and became inferior to the female protagonist's expectations, thus finding himself relief.
The male protagonist's situation is the most complicated (psychopathy), happiness and pain coexist. The happiness he seeks is similar to that of the police for his wife, so the police can understand that he thinks he will kill again. And his escape is very covert, his memory will disappear when he falls into happiness, so as to seek new happiness. Getting along and communicating with the female protagonist makes the male protagonist slowly remember some of the wrong things he did, recall the joys and pains that were originally deleted, and slowly learn to control himself and change himself. And the heroine's incomprehension and suicide made him fall into a vortex of pain. In the end, the policeman's words seemed to be saying that the policeman's wife's illness has another hidden meaning, and it is human nature to be complicated.
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