Lee Hong Kum

Lee Kei-hau is happily married with a son. His wife Wong Tai-chu, who has been complaining of discomfort lately, goes to see a doctor where her friend Wong Mau works as an assistant. Wong mixes up her report with that of a cancer patient. Believing her days are numbered, Tai-chu discusses with her mother to choose a second wife for Lee and finds the nurse So Lin-yung, Mau's girlfriend. Mau feels obligated to adhere to her request to hire So as family nurse. Lee urges his wife to make regular exercise a habit to improve her health but when his advice falls on deaf ears, he spurs her to action by dating the nurse. Infuriated by his wife's unexpected exhilaration, Lee accuses her of having an affair with Mau. Tai-chu retaliates by displaying great affection towards a man, her girlfriend Judy in disguise. Lee chases after the beau relentlessly and is told the truth by Judy. Mau's blunder is patched up with a smile, for his lover So, and for the reconciled couple Tai-chu and Lee.

Dirt-poor painter But Ka-sing lives under the same roof with Tang Chan-sin and Lee Tai-hak. Smitten with Tse Mei-chen, the penniless suitor resorts to staging a suicide and makes a fortune of his paintings which are sold at sky-high prices after his feigned death. Reinventing himself as a doctor, But competes with the rich heir Fung Chak-chak to win Tse's heart with an avalanche of gifts and money. However, Tse rejects the suit of the philistine. But gives up his windfall and tells the truth at his memorial exhibition. Thrilled, Tse pledges her love and marries the painter, for better and for worse.

The Diary of a Husband serves as an illustration for the arrival of the white-collar economy, in which the extended family is replaced by the smaller nuclear family. It is a story about four pals who work at the same office, which, like other white-collar workplaces, has become the men's primary site of life, where livings are made and friendships fostered. Meanwhile, their wives have fostered something of their own—a brigade to catch cheating husbands. Much comedy is then generated by the cat-and-mouse game between the men and the women...The battle line drawn here between the sexes remains for years, to the extent that this very same story has been retold many times in Hong Kong films, including Men Suddenly in Black, the 2003 Pang Ho-cheung film with a similar Chinese title.

Yim Tai-hung stages a diamond heist but one of his men slips away with a diamond necklace. Sustaining a fatal wound, the betrayer gives the necklace to his friend Chow Ping at Rose Apartment before he expires. Chow calls her cousin Wu Nga for help. But Wu, Wong Ang and Heung At come too late. She however manages to reveal the whereabouts of the necklace at her last breath. The trio is framed for the murder but is later acquitted. Striving to crack the case, Wong infiltrates the apartment at night and uncovers the necklace, which is then used to lure the real culprit out. But her plan is foiled by a young and reckless Wu who falls into Yim's trap. Luckily Wong and Heung deliver the hostage to safety while the police arrest Yim's accomplices and kill the ringleader in the ensuing shootout.