"Detective Investigation Files" revolves around the professional and meticulous investigations carried out by a group of dedicated police officers. As they delve into mysterious deaths with unclear causes, they tirelessly work towards maintaining peace and security for the people. However, their demanding job often comes at the expense of personal happiness. Cheung Dai Yong, a brilliant and astute police officer, has a track record of solving crucial cases. His trusted colleague, Lee Chung Yee, stands by his side, and together they tackle challenging and complex cases. Amidst their work, Dai Yong encounters Ko Jit, a tenacious journalist. Despite their initial conflicts, a deepening connection blossoms between them. However, Ko Jit already has a romantic partner.
Kenix Kwok Ho-Ying
高婕 Ko Jit (Jessie)
Michael Tao Tai-Yu
张大勇 Cheung Dai Yong
Joey Leung Wing-Chung
李忠义 Lee Chung Yee
Yvonne Lam Yee-Man
雷肖凤 Lui Chiu Fung
Maggie Chan Mei-Kei
高敏 Ko Man
黎泓和
张大勇（国语配音）
Danny Lau Dan
张百川 Cheung Pak Chuen
Merry Birchfield
张小柔 Cheung Siu Yau
Deon Cheung Chung-Chi
阿标 Biu
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.
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