What do you think about the film Lust. Caution?

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The film is very popular in China now! I don't konw whether you think the seeing value ,but its box office receipts has already exceed 100 million! I have never seen the film, but I agree whith the last one that good guys always have not happy ending in real world. What do you think of this film? Is that you favorite film? Or have just followed other people?