Against the backdrop of neon lights in Hong Kong, there is a hidden dark side that nobody knows - the city is the hub of narcotics from all over the world. Rewind ten years and Narcotics Bureau has apprehended Man Wah, aka Drug Lord
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.
Sergeant Ko Fai completed undercover operations many years ago, and there is always a cloud hanging over him. Ko Fai is reassigned to a police precinct that is Crime Squad Station Sergeant Fong Chi-kiu’s territory. While investigating cases, the duo gradually familiarize with each other and develop tacit understanding. Chi-kiu is so dedicated to her job that she has no time for taking care of her family. Her son hangs out with the wrong crowd and gets into trouble. Hotpot restaurant lady boss Lo Sin-man was naive when she was young as she slept with gang boss Law Wai and gave birth to a girl called Lo Siu-po. Fortunately, Ko Fai has always taken care of Sin-man and her daughter. Siu-po becomes a KOL and wants to step into the spotlight by engaging in reckless maneuvers. She gradually descends into the abyss as she reveals how drug dealers go about their business. To protect their loved ones, Ko Fai and Chi-kiu become guardians of the night and are determined to eradicate the villains!
In the 1930s, Bo Ching-wan and his family have come to crime infested Tong Yan Street in Bangkok. His father Bo Tin-ha tragically dies after he has teamed up with Lin Chun-shan to rebel against Lo Heung-tung. Ching-wan’s younger brother and sister have also gone missing. His mother Ting Sai-fung has become emotionally unstable. Twenty-five years later, Ching-wan sets foot in Tong Yan Street again and encounters a swindler called Chin Chin-chin. Chun-shan’s son Lin Gik turns out to be a corrupt cop. His colluding partners Pang Kin and Kam Lung are bosses of the two most notorious gangs. Pang Kin’s only son returns to Bangkok with his fiancée Ching On-na. However, he is assassinated, causing the two gangs to clash with each other. Ching-wan establishes Overseas Chinese Society of Bangkok. Ching-wan and his partners encourage good deeds and punish the baddies. The Society is in disarray as it repeatedly faces up to difficulties. There is still a long way to go before the chums find peace.
The organization to which agent C9 Yue Siu-Kiu belongs is eradicated. Lonesome Siu-kiu encounters vegetable vendor Ko Tai-king. After getting married, she takes care of her father-in-law Ko Au, big sister-in-law Ko Ching-lai, younger brother-in-law Ko Tai-kiu and stepson Ko Hei-long, who collectively make up a dysfunctional family. She has become a proper housewife after five years. Siu-kiu’s former partner B3, who had escaped death, abruptly shows up to ask Siu-kiu to help find the culprit behind the demise of their organization. While Siu-kiu is keeping Tai-king in the dark, she simultaneously takes care of her family and carries out spying activities. But she does not perform well in either job. Black Hole, a terrorist group, goes after Siu-kiu as her identity is exposed. To protect her family, she bravely confronts Black Hole. Some shocking truth is also uncovered in the process, forcing Siu-kiu, Tai-king and their chums to engage the terrorists in a duel!
Cheung Fei Fan, Ho Tit Nam and Ha Tin Hang are brothers who have been separated for many years. When the three were young, their lives scattered because of the 1997 Asian financial crisis. Many years later, they reunite and slowly they find out that there was a great conspiracy in their past.
Kwok Hei Sin is not your ordinary police constable. He is an expert in geomancy, which he uses at critical moments to solve mysterious cases. He also has Leung Sing Kau, who is connected with people conducting both legal and illegal activities, as his informant. His outlandish character often leaves his superior, Che Gwai Fei , astonished. She is a criminal psychologist who uses rationale to analyze everything. They appear to be polar opposites, yet through working together, they develop an unspoken mutual understanding. Outside of work, she only cares about the marriages of her younger siblings, Che Gwai Yan and Che Gwai Gwan. When Che Gwai Yan becomes involved in a love triangle with Leung Sing Kau and Tit Neong Zi, Che Gwai Fei loses control of her emotions. Luckily, Kwok Hei Sin is there to help her. At this time, a series of missing persons cases occur. The culprit's modus operandi evokes Kwok Hei Sin's memories of the past, which he has been hiding for many years.
A story about two brothers of the same mother but different fathers. "Sam" Kiu Tin-seng and Lo Wai-son separate after growing up together. Over the course of twenty years, with major historical events occurring in the background of their lives, the two brothers face different moral life struggles while living in Hong Kong and Macau.