Hung Sue Gan starting from the bottom, established his own logistics company, which is now running smoothly. His only concern now are his three daughters. His eldest daughter has immigrated overseas. His second daughter Hung Yeuk Shui has reached the marriageable age, but has no hopes for marriage anytime soon. She is constantly bickering with her younger sister Hung Sum Yue, who is an honour student, over trivial matters, causing their father to not know whether to laugh or cry. Hung Sue Yan, Hung Sue Gan's brother, moves in with the family, temporarily ending his life as a nomadic photographer. He joins Hung Yeuk Shui's company and encounters Ko Pak Fei, the director of an online shop. The two appear to be former lovers, making for lots of laughter. Since Hung Sue Yan moved in, a series of strange events have occurred in the family. Upon investigation, the source is traced to Lung Ging Fung, a promising young man who is the son of department store mogul Lung Gam Wai.
Kan Yiu-yeung, Ku Ka-keung, Kiu Po-po and Kiu Tai-nam were once CTRU’s Formidable Quartet. An incorrect decision in an operation caused the breakup of their friendship. And the quartet went their separate ways. Fast-forward to the present and an indiscriminate homicide again brings the quartet together. But there are still certain unresolved issues between themselves. POTT is Counter Terrorism Intelligence Cadre’s other elite task force. Team leader Fong Kwok-hei admires Po-po and asks her to become her subordinate. Team member To Siu-jie fancies her partner Yiu-yeung and finds out Po-po is Yiu-yeung’s ex-lover, so she “starts a war”. Successive explosions happen in the city. While investigating, Po-po asks prisoner-cum-hard criminal Dr. Hong’s for help, and the process is surprisingly easy. Actually, Dr. Hong has some trick up his sleeve.
Thirty years ago, hardened criminal Yip Siu-tin is arrested for armed robbery and sentenced to prison. Siu-tin’s daughter, who has handled the loot, changes her name to Cheung Sum-yuet and starts a new life. She also gets married to yacht company boss Yen Ho-yin. Meanwhile, Chong Chi-kiu is a kid left behind by an accomplice who has died because of the robbery. Kind-hearted Tang Sing-him becomes his foster parent. A traffic accident causes Chi-kiu and Sum-yuet to run into each other again. But this accident somehow has something to do with Siu-tin, who is just released from prison. Sum-yuet can no longer avoid Siu-tin, who is a nightmare to her. Her marriage also has certain issues. Police officer Yeung Yan-hiu intervenes by launching an investigation, and she keeps going after Siu-tin and Chi-kiu. Unresolved grudges for thirty years are again put on the front burner. Everyone implicated in a robbery of yesteryear is drawn into this mess.
After leaving her boyfriend, veterinary surgeon Kam Wai-ting moves to Sai Kung with her beloved dog Donut and starts a new life. At her new workplace, Wai-ting meets animal communicator Wong Sing-yan. The duo often quarrel due to their different values regarding pets. In an accident, Sing-yan acquires skills for communicating with Donut, and a man and a dog gradually build a friendship and help each other. Sing-yan learns from Donut that Wai-ting has some love issues, so he helps her decipher her conundrum. The duo's relationship improves, and they gradually like each other. However, they do not have feelings of affection due to their age difference. Donut wants to play matchmaker for the duo, but it gets into hilarious situations. And its ideas even backfire. Each of the duo also has their own admirers, resulting in more obstacles in their relationship.
Many people die as old-fashioned tenement Wai Lei Building abruptly collapses. Engineer Sze Kwong has conducted a survey of the building. He arbitrarily investigates the incident as he reckons the building collapse is shrouded in intrigue. While the incident is being unraveled, Sze Kwong’s girlfriend Cheung Man, who is some property developer’s lawyer, dies in a traffic accident. Then his younger half sister Auyeung Ka-shun meets her death. Sze Kwong is also silenced. Sze Kwong comes round and surprisingly returns to somewhere in time before the building collapses as the deity has given him a chance to live again! Sze Kwong suspects the building collapse has something to do with property developer Hong Wing-yan and his mentor Ying Yiu-wa. He wants to prevent the disaster from happening. To avoid implicating Cheung Man and Ka-chun, Sze Kwong decides not to recognize his sister and he also does not go out with Cheung Man. He just covertly watches over the duo.
In some faraway place, the Laws and the Chuks are two big families that have been foes for a century as they can never stand each other. In a chance encounter, the Law Family’s fourth son Law Mak-au falls head over heels in love with Chu Lai-yip, who is the younger cousin sister of the Chuk Family’s matriarch Chuk Ying-kiu. Lai-yip already has a finacé. If her marriage eventually falls through, Ying-kiu’s status as the chair will be affected. However, due to some past event about herself, Ying-kiu resolutely decides to let Lai-yip make her own choice, sowing the seeds of a duel between the two families. In the meantime, Leung Shan-pak adopts Max Ton as his name and lives in Hoi Pak City, which is the Law Family’s territory. To avoid assassins, he goes to the Chuk Family’s Tin Nam City and then the mysterious Zone 8. He again runs into two women who were seemingly associated with him.
A “doppelgangers” website has facilitated the connection between two complete strangers that look like identical twins. Law firm partner Ko Sau-shing tracks down his former lover Yu Fung, whom he has not contacted for ages, online, and Yu Fung is looking for a part-time boyfriend with a similar appearance to him. Sau-shing arbitrarily approaches applicant Mo Kei-nam, who is a dead ringer for him. The duo also covertly agree to swap identities for two weeks. Sau-shing plays the role of Yu Fung’s “substitute lover”, and deadbeat Kei-nam disguises himself as Sau-shing while simultaneously dealing with his wife Lee Chi-ying and father-in-law Lee Kwun-hang as each and every crisis at the law firm is handled by him. While the identity swapping deadline looms, this pair of lookalikes are eventually shocked to realize their mutual life trajectories are already different from their expectations.
