Detective Investigation Files IV (Chinese: 刑事偵緝檔案IV) is the 4th and final installment of the Detective Investigation Files TV franchised by TVB in Hong Kong. It is a complete reboot of the series, with new cast. The series focuses on the lives of two detectives, Tsui Fei (Louis Koo) and Kong Chi Shan (Sunny Chan), and the murder cases they deal with.
古天樂
as 徐飞
宣萱
as 武俏君
陳錦鴻
as 江子山
佘詩曼
as 文婉兰
李珊珊
as 唐心如 Tong Sum Yu
林芷筠
as
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