Lust, Caution: an interpretation (spoiler)
Spoiler level: High. If you haven't seen the movie, don't read this piece.
Why did she do it?
This is perhaps the biggest question that people asked after watching the film. Why did she do it? There are indeed several interpretations, all possibly true. A romantist would say it was love. Love is blind! Love is crazy! A biologist would say it was the hormones. Once she saw that big bling, her glands produced chemicals that disturbed her rational thinking. Whatever dude, there's a reason why I dropped my bio major.
A couple of days after watching the film, I came across the original short story in a bookstore. At the end of the story, there was an essay written by the scriptwriter answering this question. The details of his essay are quite blur, so I'm going to paraphraze like crazy. I might be misinterpreting him, but I don't give a damn. According to the scriptwriter, her act poses many questions to the audience. The audience is left puzzled, and does not clearly know her intentions. This was the precise effect the writer wanted. By depicting an unexplicable act, the author wanted to show that some things in life are just unexplicable.
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