Detective Investigation Files IV

Detective Investigation Files IV (刑事偵緝檔案IV)
Detective Investigation Files IV Poster
Genre	Modern Drama
Starring	Louis Koo Sunny Chan Jessica Hsuan Charmaine Sheh Lee San San
Opening theme	"萬里陽光" ("10,000 Miles of Sunshine") by Edmond Leung
Ending theme	"宇宙無限" ("Universe Unlimited") by Edmond Leung & Louis Koo
Country of origin	Hong Kong
Original language(s)	Cantonese
No. of episodes	50
Production
Producer(s)	Poon Ka Tak
Running time	approx. 45 minutes
Release
Original network	Television Broadcasts Limited
Original release	March 29 – June 4, 1999
Chronology
Preceded by	Detective Investigation Files III
External links
Website

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 won two TVB Anniversary Awards, including Best Actor for Louis Koo and Best Actress for Jessica Hsuan.

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.

Because of his misbehavior, Tsui Fei (Louis Koo) is a sergeant sent to work with Senior Inspector Kong Tze Shan's (Sunny Chan) homicide team at the Hong Kong Central Police Station. He has been emotionally unstable since the disappearance of his girlfriend Leung Chin Chin (Anne Heung) three years earlier. At first, his attitude is not welcomed by the other officers, especially Hon Kwok Yan (Edmond So), but they soon get along. Fei and Tze Shan eventually become best friends.

While investigating his first murder case, Fei meets psychologist Quin Mo Chiu Kwan (Jessica Hsuan) and the two fell in love. Because Fei still misses his ex-girlfriend, the two frequently quarrel.

Tze Shan has a beautiful girlfriend, Man Yuen Lan (Charmaine Sheh), but Yuen Lan's best friend Tong Sum Yu (Lee San San) is also in love with him. Sum Yu tries hard to stop loving Tze Shan, until Yuen Lan's father Man Kwok Tai (Law Lok Lam) kills Leung Kim Hung (Kwok Fung) - Tze Shan's fellow officer and Chin Chin's brother - in order to frame an old enemy. Kwok Tai forces his daughter to assist his crime, but in the end they are both captured and sent to prison. Yuen Lan gives Tze Shan up because of this.