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.
KO TIN SAN an LAW WAI SHUN are half-brothers, same mother different father. Due to fate, they were not only separated into Hong Kong an Macau, but also grew up in different backgrounds that have caused serious conflict between the brothers. Their mother CHOW YUK MUI brought her youngest son WAI SHUN to Macau and lived in a black market. WAI SHUN strived hard to get through all the hardships and challenges with the help of his good friends YIU MAN YING and LONG FEI. Ultimately, WAI SHUN set foot on a successful path in life. Living alone in Hong Kong, TIN SAN took shortcuts in life, he partnered with a gangster KEUNG YUNG from the triad and had an affair with a wealthy girl. His actions broke his girlfriend CHEUK JING's heart. She eventually losses her beauty an possessions.
After reaching a point of no return in his life, Ngo Pak Yin grows power-hungry. Through his aggression and strict grasp of the law, Pak Yin paves his way to becoming one of Hong Kong’s top solicitors. But power often leads to blindness. Pak Yin becomes ruthless and inconsiderate of others, leading to his wife Rebecca Tsang Bo Lam, who had quietly supported him through the years, to grow more distant. She realizes that they no longer share the same values, and is heartbroken. During this time, she grows closer to Patrick Lui Wing Hang, who opens up a window into her inner world. Patrick is also a solicitor, but he is neither as famous nor as abled as her husband. Despite these setbacks, Rebecca falls in love with Patrick, who seems to be the only person who can fulfill her troubled heart. She makes the executive decision to leave her husband, but is suddenly attacked by a mysterious man. She suspects that Pak Yin had hired someone to attack her. Pak Yin’s life is at an impasse once again. Finally realizing his wrongdoings, Pak Yin decides to change for the better. But this time, he’s changing while carrying a heart of gold.
MA FU, a retired employee of the HK Correctional Services Department, moved back to live with his son after retirement. MA FU treats and disciplines everyone in his family as if they were the offenders he works with in his job. His youngest son MA CHONG feels like he's in jail when he gets home, and his father is even often involved with his job as a paralegal. The father and son get into disputes daily and his elder brother MA KEUNG and his wife LO LAI SEUNG are often stuck in between and have to settle the disputes. The couple also holds the heavy responsibility of raising their kids. Three generations in the MA family all live together and encounter different situations, experiences and system of values.