Sunny Chan
The reason to this may be due to the loss of most of the original cast. Sunny Chan left TVB shortly after filming the series, and Lee San San also stopped acting. Louis Koo also turned to cinema and singing a few years later. Although Sunny Chan returned to TVB in 2004 (and even starred in a drama with Jessica Hsuan), the "Detective Investigation Files" phenomenon had already faded by that time. Meanwhile, Jessica Hsuan and Charmaine Sheh are still two of TVB's most popular actresses.