Hong Kong was quickly becoming industrialised in the 1960s. The market was hungry for female labourers with a grasp of crafting skills. In addition to being wives and mothers, many women entered the labour market at that time. This ‘streamlined comedy' (as it was advertised) is called Three Love Affairs, but the main action is centred on the lovers played by Ting Ying and Cheung Yee. In order to make themselves more appealing, the factory girl pretends to be the daughter of a successful businessman, while the chauffeur pretends to be from a wealthy family. Their relationship is fraught with worry and anxiety, because they are confused about their own identities, and have not yet come to terms with themselves and their lives. With the support of the Manufacturers' Association, the film was shot on location at an actual factory, evidencing a prosperous period in Hong Kong's industrial history.

Madam Kum is a well-known dance hall girl. She gave birth to her daughter Yin-fan. Kum gave her to some relatives. Nineteen years go by, and Kum accidentally runs into Fan's husband, Man-fai, in Singapore. She tells him everything. Fai is surprised but accepts the truth. They have a talk and agree not to reveal the truth to Fan. However, Fai promises Kum that he will arrange for her to see Fan. Gum starts to see Fan on public occasions. Bing-chiu, who has been chasing after Fan since college, runs into Fai and Kum. He tells Fan about it. Fan goes to Kum to ask her not to destroy her family. Kum is hurt but still does tell her the truth. She decides to returns to Singapore. She goes to Fan's house to see her once more. Fan is having her birthday party. She insults Kum and throws a glass of wine in her face. Fai cannot stand it anymore and tells his wife who Kum really is. Fan feels guilty. All the others are moved by what Kum has suffered and they start to accept her.

Rascal To Chai-yan brings a false charge of selling fake medicine against doctor Fan Tin-sang, who is sentented to a twenty-year imprisonment. Fan makes an escape after a decade, and secretly provides for the education of his son Fuk-kwan brought up by a poor blacksmith. Fuk-kwan grows up to be a doctor practising in the country. To again does harm to Fuk-kwan, only this time Fan intervenes. Both he and To die in the fight.

Vagabond singer Ali is embroiled in a dispute over love and is compelled to return to his own country. Ali is mistaken for the future queen's consort and chances to meet her majesty Law Yee. Law falls head over heels for Ali and they get married not long after. However, Ali finds royal formalities unbearable and decides to run away from the palace. Disregarding all rules, Law follows her man to wherever he goes.

Morris the Tailor seeks to get even with Gilbert, Earl of Chen who has stolen a set of expensive clothes from him. Morris bumps into Princess Jenna and the two fall in love at first sight. But the king voices his opposition since Morris is from the grassroots. Gilbert suggests that Jenna's aunt adopts him as her foster son. In a split second, Morris is elevated to a royal and becomes the king's son-in-law.

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.

Reporter Yu Mong-yuen is recovering from a leg injury in his fiancee Man-wah's apartment. Bored, he looks out the rear window and observes the life of the neighbouring building. Among the tenants are a sugar-daddy and his mistress, a middle-aged man wants to marry a young girl, but she is in love with his son. Finally, she hatches a plot and makes the man agree to her marrying his son ; a sly fortune-teller ; a lively gym, a rich widow quarrels with the trainer of a gymnasium because his dog has bitten her cat ; and an opera school, a woman signs, leaning on the balcony, and a man tries to strangle her. In fact they are rehearsing an opera…… One evening, Wah is on the night shift, and Yuen watches the opera troupe rehearse to the end. Under the influence of drugs, Yu mistakenly believes that a divorced man has murdered a taxi dancer. He alerts the police, but the whole thing is nothing more than a misunderstanding.

HK drama film.

Guerrilla member Ting Siu-yuen works as a playwright and Lee, the leader of an opera troupe. They conceal their identities in the troupe in order to gather military intelligence. Yuen gradually falls in love with the lead actress Mui Law-heung. Ting is unsettled to learn that County Chief Fong covets Mui. He sneaks into Fong's residence and is astounded by the sight of his old lover Pak Kuen, now Fong's wife. Fong colludes with the military chief in conducting vicious schemes. With Kuen's help, Yuen is able to get the intelligence. But as Heung is not an insider, she reports to the Governor about the illicit relationship between Yuen and Kuen. Kuen backs Yuen to eliminate the conspirators and bring about the union of Yuen and Heung.

Third Sister Tai marries Dunce Lau and her life has since been between laughter and tears. At the birthday party of Tai's father one year later, Lau's wit suddenly comes back to him. Lau turns the occasion into a stage for displaying his talents and makes fun of his two brothers-in-law who used to despise him.