Lust, Caution () is a 2007 erotic period espionage romantic mystery film directed by Ang Lee, based on the 1979 novella by Eileen Chang. Lust, Caution is set in Hong Kong in 1938 and in Shanghai in 1942, when the city was occupied by the Imperial Japanese Army and ruled by the puppet government led by Wang Jingwei. The film depicts a group of Chinese university students from The University of Hong Kong who plot to assassinate a high-ranking special agent and recruiter working for the puppet government by luring him into a honey trap. The film is generally accepted to be based on the historical event of Chinese spy Zheng Pingru's failed attempt to assassinate the Japanese collaborator Ding Mocun.

With this film, Lee won the Golden Lion Award at the Venice Film Festival for the second time, the first being with Brokeback Mountain. The film adaptation and the story are loosely based on events that took place during the Japanese occupation of Shanghai. The film's sex scenes resulted in the film being rated NC-17 in the United States. The film grossed $67 million worldwide over $16 million budget, making it the highest grossing NC-17 rated film of all time.

Lust, Caution

Meaning of the title

The title of the work, Lust, Caution, has a double meaning in Chinese. The character for "lust" (色, sè) can be read as "colour", while "caution" (戒, jiè) can be read as "ring", therefore the title can also read as "colored ring", an object that plays a pivotal role in the story. The two alternative readings of the title are interwoven into a cautionary tale of lust and love through the symbolic use of the ring.

Lust, Caution

Plot

Hong Kong 1938

During the Second Sino-Japanese War, a shy and inexperienced university student, Wong Chia Chi, travels from Shanghai to Hong Kong to begin studying at Lingnan University. Male student Kuang Yumin invites her to join his patriotic drama club and she soon becomes a lead actress, inspiring both her audience and her colleagues. Inspired by the club's patriotic plays, Kuang persuades the group to make a more concrete contribution to the war against Japan. He devises a plan to assassinate Mr. Yee, a special agent and recruiter of the puppet government of Wang Jingwei set up by the Japanese occupation in China. The beautiful Chia Chi is chosen to take on the undercover role of "Mrs. Mak", the elegant wife of a trading company owner. She inserts herself into the social circle of Mrs. Yee.

Lust, Caution

Chia Chi catches the eye of Mr. Yee and tries to lure him to a location where he can be assassinated. Chia Chi is still a virgin, and she reluctantly consents to having sex with another student involved in the plot in order to practice her role as a married woman. Attracted to Chia Chi, Yee nearly falls for the trap but backs out at the last minute. Soon after, Mr. and Mrs. Yee move back to Shanghai, leaving the students with no further chance to complete their mission. While they are preparing to disband, a former subordinate of Yee turns up unannounced and tells them that he is aware of their plans. After a violent struggle, the students kill the subordinate and then go into hiding.

Shanghai 1942

Three years later, in Japanese-occupied Shanghai, Chia Chi again encounters Kuang, who is now an undercover agent of the Kuomintang (KMT) secret service the Juntong, which is seeking to overthrow the Japanese occupation forces and the puppet government. Kuang enlists her into a renewed assassination plan to kill Yee, who has become head of the secret police department under the puppet government, and is responsible for torturing and executing resistance members working for the KMT. Chia Chi's advances to become Yee's mistress are reciprocated. During their first sexual encounter, Yee violently rapes Chia Chi. Over the next few weeks, their sexual relationship becomes more consensual and affectionate, stirring conflicting emotions in Chia Chi.

When Chia Chi reports to her KMT superior officer, she exhorts him to carry out the assassination soon, so that she will not have to continue her sexual liaison with Yee, but she is told that the assassination needs to be delayed for strategic reasons. Chia Chi describes the emotional conflict she finds herself embroiled in, sentimentally bound to a man whom she is plotting to help assassinate. When Yee sends Chia Chi to a jewelry store with a sealed envelope, she discovers that he has arranged for a large and extremely rare six-carat pink diamond for her, to be mounted in a ring. This provides the Chinese resistance with a chance to get at Yee when he is not accompanied by his bodyguards.