Tin Yam is a professional engineer. His wife died when their son, Sai Hei, was eight years old. He then married Tak Kiu, who is a teacher. Yam thought he found a good mother for Hei but then he later realised that he had shouldered onto himself the responsibility of taking care of Kiu’s family! Time flew and ten years have now passed. Yam organises a birthday banquet for his father-in-law, Kai Cheong. He asks his colleagues to attend the dinner and Hei invites a sexy showgirl to join and add fun to the event. However, Kiu’s sister, Tak Lan, mistakenly thinks they are having an affair. Yam’s new boss, Chung, is the son of the big boss. He wants Yam to privately take on old building renovation jobs. Kiu is worried that she will be laid off as she scores low on her language aptitude test. She is in a bad mood and thinks that Yam no longer loves her. Hei follows Yam to see if he is having an affair and finds that he isn’t.… ...

Lan is shocked to learn that Kiu has not had sex with Yam for six months and she believes that Yam must have been seeing someone else. She is determined to find proof with the help of their youngest sister, Wai. Hei defends Yam as he once followed him and knows that he is really busy with work. However, shortly afterward, Hei discovers that Yam frequently hangs out in nightclubs and then Hei regrets that he defended him. Hei uses an AIDS prevention promotion leaflet to remind Yam to behave. But Yam thinks Hei is infected with the deadly disease. After clarification, Hei discovers that Yam is suffering from a pain that any man would keep to himself… Kiu is finally done with her language aptitude test. With the help of Lan and Wai, she plans for a romantic night with Yam. Hei, in order to save his father, proposes an idea…

Hei leaves behind the AIDS prevention promotion leaflet at the house where he is delivering some takeaway. Fu, a talented high school student, thinks that he is infected with AIDS. Hei nearly makes Fun miss her exams. Fortunately, she finally makes it to the exam centre. Hei is cleared for not having AIDS and his boss allows him to resume work. However, he resigns since he is not happy with his boss. Yam wants to scold Hei but Cheong comes to his rescue. He asks Hei to go out with him to play. Cheong meets an old friend and lends him a huge sum of money when he knows he is in need. Lan is furious and Cheung is angry at her overreaction. He then disappears. Luckily, Yam guesses where he goes and brings him back. Yam places a bet with Hei and loses. He is forced to stop going to nightclubs to work off his stress…

Hei goes to work at the Japanese restaurant owned by Chi and Man. He comes across Fun there. He invites Fun to join him at a street party and they have fun together. Kiu begins to lose her faith in teaching as the parents of the school children keep complaining. She is even more worried as she finds that Hei is not working. Yam decides to join Chung’s team, though he doesn’t like him. In order to work off his stress, he secretly goes to nightclubs again. Hei feels bad when he sees that Kiu is upset with Yam’s indifference to her and he cannot tell her the truth. He tries his best to comfort her. He volunteers to join a counselling camp with her to offer help. He is not aware that Fun is also one of the volunteers at the camp…

Yam seeks help from Lei and she reasons that the root of his problem is due to some mental stress and proposes to help him solve his problem at a hotel. However, Lan and her friends follow them and ask them to explain… Fun and Hei find shelter from the heavy rain and spend the night in a deserted house. They are attracted to each other and sleep together. However, Fun is lost as she is not sure about her relationship with Hei and she doesn’t know how to face her family for she is afraid she will get pregnant. Yam continues to seek help from Lei and from their conversation, he finally realises the reason for Kiu’s recent crazy shopping and knows Kiu is still suspicious of him meeting with Lei at the hotel…