Using the political decline of Northern Song dynasty as the background, this is the story of the Four Great Constables upholding justice while punishing the wicked.

• Raymond Lam Fung
• Kate Tsui Tsz-Shan
• Kenneth Ma Kwok-Ming
• Selena Lee
• Sammul Chan
• Vivi Lee
• Ron Ng Cheuk-hai
• Cilla Kung