What is Lust, Caution about?

Lust, Caution tells a story that happened in War of Resistance against Japanese Aggression's time. Wang Jiazhi is a student of Lingnan University. She has no parents and lives in her uncle's house. She came to Hong Kong University to study because of the war. At the University of Hong Kong, he joined the drama club organized by Kuang Yumin and fell in love with him. Later, they performed a drama related to patriotism. On the stage, they shouted "China can't die". Later, they learned from the news that mr. yi, the head of Wang Jingwei's puppet government spy, was in Hongkong, which inspired their patriotic feelings. They only killed traitors on the stage and began to plot to assassinate mr. yi. As a spy leader, mr. yi was wary and suspicious, so the only way to approach Mr. Yi was to be feminine, so he became a pawn. Wang Jiazhi pretended to be Mrs. Mai, approached Mrs. Yi, and then approached mr. yi, and mr. yi was gradually attracted. Mr. Yi sent Wang Jiazhi home, and the other five people ambushed at home. Unfortunately, Mr. Yi didn't come into the room, and the assassination failed. Kuang Yumin thinks that Teacher Yi has been attracted, but those who are not familiar with the world don't know anything about men and women, so he has sex with Liang Runsheng, the only one in the troupe who has been to a brothel. But then mr. yi suddenly received an order to leave Hongkong. But the adjutant around mr. yi discovered their purpose and came to their residence to blackmail them. In desperation, six college students who had never killed anyone brutally killed the adjutant. The assassination failed, and Wang Jiazhi, who made great sacrifices, was disheartened. Two years later, when Hong Kong fell, Wang Jiazhi returned to Shanghai, where she met Kuang Yumin again. At this time, Kuang Yumin joined the puppet government and received orders from the upper level to assassinate mr. yi. Kuang Yumin hopes to continue to attract Yi, but he is indifferent. She returned to Mr. Yi's sight, and Mr. Yi, who had long liked him, finally could not restrain his inner desire and had a relationship with him. At this time, Wang Jiazhi found that she had more feelings for mr. yi than the target of assassination, so she eagerly went to Kuang Yumin to ask for the assassination of mr. yi as soon as possible, but Kuang Yumin told her that she could not assassinate now. At this point, Wang Jiazhi has nearly collapsed and fallen into a deep struggle. She also thought about killing mr. yi during sex, but after struggling, she chose to give up. So I let myself fall in love with mr. yi and gradually forgot my mission.