Sissi's words reveal the mystery of the whole story.
We are not bad people, we were just born in that place. The protagonist's relationship with his sister made Brandon feel so filthy, so he fell into his own filth and indulged in sex addiction. He kept doing this while ignoring the phone call from his sister, trying to just forget about the past. Just when he thought he could be relieved like this, his sister suddenly appeared and slept with his boss. This aroused his jealousy and made him think back to the past once again, and fell into it. He said, "You've got me stuck every time" (the one that got mad at his sister) and then it was like looking for real love, but holding back (pretend incompetence) for fear of sullying a good woman. In the end, when I look back, I find that the one I really love is Sissi. So I cried in pain and shame in the rain. The woman at the end of the film is the echo of the film, everyone is ashamed, but I don't know how deep it is.
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