In Hong Kong, family members of a missing person may apply for the person concerned to be declared legally dead after seven years. While production house boss Yeung Man-sum decides to forget his wife Koo Ching-tin, who has been missing for seven years, and marry his lovely and supportive girlfriend Chu Sin-mei, his son Chi-hin’s birth mother Ching-tin astonishingly turns up! Due to some falling off a cliff accident, Ching-tin became forgetful and ended up homeless somewhere overseas. With lawyer Kam Cheung-sing’s help, Ching-tin returns to Hong Kong after seven years. She wants to retrieve her old memories. Ching-tin again works as a journalist. She curiously finds out someone seemed to have harmed her when she went missing. Meanwhile, Man-sum is torn between his new love and wedded wife. And he is worried about Ching-tin recovering from amnesia as the situation could get out of hand.
Since relocation to Chek Lap Kok in 1998, passenger traffic at Hong Kong International Airport has increased threefold in twenty-five years. And Yeung Sheung-wai, who started out as a clerk, has been promoted to IAC Duty Manager. He is tasked with overseeing the operations of the airport. Sheung-wai also has a contingent of amicable partners, including his assistant-cum-admirer Fong Ho-yee, Lui Chi-shan – who handles airport passenger services – Chan Kit – who takes care of aviation security – and Lee Sing-cheung, who is responsible for apron services. They collaborate to assist in dealing with all kinds of incidents that take place at the airport. Sheung-wai keeps in touch with his ex-wife Cheung Yeuk-ling, Metro Harbour Airlines Airport Supervisor. Actually, they still think of each other after their divorce. The duo’s relationship is rekindled when airline captain Kwok Kai-kwong and flight attendant Ko Nga-man turn up.
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.
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.
Yeung Yut Ching, an elite in the bodyguard world, is good at risk management and is the winning team in life. However, his unhappy childhood made him refuse marriage, and fate made him meet Yau Tze Ching, a clever woman who keeps breaking the rules of his life.
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.