Hong Kong traffic E&C inspector To Cheuk Fung is dedicated to his mission. He and his subordinates often go undercover so they can easily prosecute those who speed, drunk drive, and hold illegal licenses. Cheuk Fung is an extremely cold person, serious in speech and manner, but he is strangely close friends with the boisterous Sze Ma of the investigation team. The duo are left speechless when they meet the rookie cop Bui Sam Yau, who they assumed would not be able to withstand Cheuk Fung’s strict demands. But after Sam Yau helps Cheuk Fung dispel a worry that he has kept locked in his heart for many years, the two grow extremely close, forming a pseudo father-daughter relationship. Sam Yau’s satisfactory performance catches the attention of Sze Ma, who convinces her to join his team. Sze Ma has been less than pleased with his subordinate Yiu Yiu, who prefers to do everything by the book and fails to catch up to Sze Ma’s painstaking style of investigating. Meanwhile, a racing gang has been wreaking havoc in the streets, sending out provoking messages to the police. Cheuk Fung and his team are given the light to track them down, but he ends up stepping into a dangerous boundary. A dark haze he has been avoiding once again appears before his eyes.

Yau Tat and Yip Fai Ting became high school friends due to a cycling competition, but lost contact with each other after Yip Fai Ting had to return to Taiwan for family reasons. Years later, they meet again at an accounting firm. Yau Tat's boss, Ling Hei, likes to play office politics and often drives a wedge between colleagues. It causes a grudge between Yau Tat and Yip Fai Ting. Fortunately, the secretary Wu Sam Lam is very considerate and encouraging towards Yau Tat. His mother, Yau Wing Ci wants to make them a couple, but Yau Tat does not want to start a relationship because of his family burdens. This is until he meets Yeung Gwong, who happens to be Yip Fai Ting's childhood friend and a fellow accountant. However, Yau Tat is hesitant to move forward because of Yip Fai Ting's feelings for Yeung Gwong. In addition, dealing with the office politics on a daily basis makes them lose sight of their goals in life. Finally, Yau Tat and Yip Fai Ting decide to put aside everything and return to the cycling track to rediscover their fighting spirit and friendship.

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.

Siu Wai-ming has been haunted by a dream of a woman wearing a cheongsam for many years. When he becomes an administrative manager for an old apartment building, he meets a tenant – air stewardess Alex Cheung – who looks exactly like the woman in his dream. As they get to know each other, the apartment building seems to come to life, performing the strange and fantastical lives of the tenants who live there.

Successful property manager Molly Ling has a golden touch. The shopping malls under her management have won countless awards, but she is a control freak. As her top assistant, her cousin Cherry Ling is at her beck and call. Just as Molly is looking forward to a promotion to the board of directors, the company brings in her ex-boyfriend Gordon Man to be her equal. Meanwhile, Cherry discovers her boyfriend has cheated on her and has been feeling pessimistic about her personal life. It is during this time when she meets a compassionate gentleman Saving Ching. But when she believes their relationship will blossom into love, Cherry finds out that Saving is afraid of marriage. Can the two cousins – both competent women – ultimately reverse their misfortune and find happiness?

Sometime after the events of the first season, Ma Kwai the taxi driver has fully devoted himself in honoring Shek Kam Dong's destiny as an exorcist. Choosing to embrace his destiny, Ma is forced to choose between family and exorcism after he encounters the spirit of his childhood friend Mok Wai Ho, who comes to him facing a mysterious threat.

Each day, night shift taxi driver Ma Kwai drives female doctor Chong Tsz-Yeuk to and from work on time, cherishing the moments they share, without realizing that he is meant to be her guardian. One night, at midnight, when Ma Kwai is urinating on a highway, he accidentally breaks the spell placed on a hundred-year-old genie, Shek Kam-Dong, and starts having inconceivable experiences. He not only sees things that others around him don't see but also receives superpowers. Though Ma Kwai initially feels very annoyed at this turn of events, he later teams up with Kam-Dong to hunt demons for money.

The Hong Kong Airport Special Police Unit (ASU) is a special police force responsible for maintaining public and aviation security, counter-terrorism, key personnel protection, disaster support and many other areas. Encountering different situations on duty, they see the joys and sorrow of life that make them reflect on their own lives. With every step forward, they establish a sense of mission as the airport security police.

Nicknamed "King of Hell", night taxi driver Qiao Zuozhi (played by Yang Chaokai) fully utilized the advantages of his profession: he frequently encountered ghosts, and finally lost all his wealth. It was not until he met his middle school classmate Gao Gu Ni (played by Huang Jiandong) that he completely overcame his fear of ghosts and monsters. Gu Ni and Zuozhi were best friends in middle school. After many years, Gu Ni had unexpectedly transformed into a scientist who specialized in the study of energy gathering of spiritual weapons. He was determined to develop spiritual power generation to save the earth's energy crisis and make money from it. Later, the two of them set up the "Demon Taxi Agency" together, hoping to save the world.