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.
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.
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.
A car crash sparks a war between local police and an international terrorist organization.
During Emperor Renzong's reign in the Song Dynasty, Bao Zheng is appointed Kaifeng Prefecture Prefect. Bao Zheng, his trusted aide Gongsun Ce, Guard Zhan Zhao, and the four Constables are determined to crack down on corrupt dealings. Merchant's daughter Yun Qianyu is an eloquent speaker. Under Gongsun Ce's guaidance, she eventually becomes a consel. Ji Niannian, a maid from Gaochang, is an autopsy expert. These two ladies help Kaifeng Seven unravel bewildering cases. However, danger is lurking everywhere in Kaifeng Prefecture. When it is revealed that the emperor's heritage is questionable, Bao Zheng has to handle the most difficult case yet as he faces the dilemma of revealing the truth or abandoning his conscience for the sake of his country.
Urban legends, seemingly true yet seemingly fantastical, connect the past and future. While conducting research at Bride’s Pool, professor of folkloristics Poon Dor-lai experiences what appears to be paranormal encounters, but soon uncovers criminal exploits behind it. She teams up with journalist Fu Chi-pok to probe into the matter, unravelling the unknown background of bride-to-be Wong Yuk. The two decide to team up to continue work on Chi-pok's missing father's research paper on urban legends, but in the process, they discover many cases that bear similarity to the legends and they begin to suspect his disappearance.
A financial tycoon, once a triad member, tries to eradicate the drug market while an old accomplice aims to be Hong Kong's first drug lord.
Following the death of his wife in a hit-and-run accident, principal ambulanceman Mak Chay-tin lives with his only daughter Lok-yee, sister Oi-fa, and sister-in-law Cheung Ho-kei. The young and naive subordinate Cheuk Ka-kit is impulsive and clashes with Chay-tin's life, while Tam Ka-jun, the training director, pursues perfection and picks on Ka-kit, creating pressure on the team. Chay-tin, being the middleman, works hard and strives to maintain the unity and cooperative spirit between the team members. He also hopes to cultivate outstanding ambulance elites, rescuing more precious lives in challenging situations.
To avoid all the strife caused by the gangland power struggles, Yuk Wan-lung and his elder sister Yuk Kiu-fung lead a quiet life, running an inn. Unexpectedly, Wan-lung is determined to take part in the New Hero Contest, seeking to win back his ex, Ngai Bing-bing. But when Wan-lung exposes a scandal involving the East Wing imperial guards, he is incarcerated and his sister must find a way to set him free.