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.
Cold Blood / Lang Ling-hei
Heartless / Shing Ngai-yue / Mou Ching
Iron Fist / Tit Yau-ha / Fok Yi
Chaser / Tsui Leuk-sheung