Main Role
- Benjamin YuenSeung Sing / Sing SirMain Role
- Kara Wai Main Role
- Philip Keung Main Role
- Ben Wong Main Role
Support Role
- Mat YeungYau Lai Kit / A Kit / Matt Sir / "Matt" [Senior Inspector of Narcotics Bureau / Senior Inspector of Crime Squad of West Kowloon Region]Support Role
- Oscar Leung Support Role
- Berg NgDing Ming Yeung / "Dominic"Support Role
- Sisley Choi Support Role
- Benz HuiKan Kwok Cui / A Kan / Kan Sir / Gin Kan / "Kan"Support Role
- Grace WongYeung Hiu Yi / Yi JieSupport Role
- Otto ChanWu Wei Zhong / A Chung / Ng Sir / Wu Gung GungSupport Role
- Gloria TangKwong Wing Sa / "Kay"[Madam Man's own assistant]Support Role
- Joman ChiangLuk Wai Kiu / "Iris"Support Role
- Angelina LoCheung Lai HanSupport Role
- Dickson YuMok Sai ChuiSupport Role
- Brian TseChan Kwok Sing / A Sing [Sing Sir's assistant]Support Role
- Bill ChanKwok Chin Leung / Yat Gor / Kwok Sir / Dai Sir / "Vincent"Support Role
- Shally TsangLui Bik Zi / Madam LuiSupport Role
- Geoffrey WongTong Zi Hou / "Hanson"Support Role
- Ken LawEddySupport Role
- Lam LeiLo Dai WaiSupport Role
- Marine LeeYuen Man Wah / A WahSupport Role
- Yeung Chiu HoiKong Zing Lung / Lung KoSupport Role
- Milkson FongFa WenSupport Role
- Au Hin WaiGovernment Official HaauSupport Role
- Cheung Sze Yan Support Role
- Erica Chan Support Role
- Lawrence Lau Support Role
- Julian Gaertner Support Role
- Mandy Ho Support Role
- Akai Lee Support Role
- Yeung Shui Lun Support Role
- Chiu Lok Yin Support Role
- Man Yeung Support Role
- Martin Tong Support Role
- So Lai Ming Support Role
- Jacky Lee Support Role
- Simon Tang Support Role
- Janice Pang Support Role
- Felix Ng Support Role
- Calvin Chan Support Role
- Aurora Li Support Role
- Burmie Wong Support Role
- Terence Tung Support Role
- Kitterick Yiu Support Role
- Zhu Hui Lin Support Role
Guest Role
- Sharon ChanSo Wai Nga / "Carrie" [Samuel's wife]Guest Role
- Amisha Ng[David's helper] (Ep. 1, 29-30)Guest Role
- Elizabeth Nicole Wu[Shipping company staff] (Ep. 3)Guest Role
- Marcus KwokDr. Ho (Ep. 5)Guest Role
- Sandy Leung[CID] (Ep. 9, 15, 17, 29-30)Guest Role
- Lo Jun Fung[Principal public prosecutor of the high court] (Ep. 17)Guest Role
- Wu Fei(Ep. 28, 30)Guest Role
- Priscilla WongJaniceGuest Role
- Li Shing CheongWan Tin Yu / Wan SirGuest Role
- Cheung Kwok Keung"TK"Guest Role
- Janice ShumLi Mae MeiGuest Role
- Tony HungYau Lai Chun / Yau SirGuest Role
- Constance KongChiu Hei Yuet [Young]Guest Role
- Louis Szeto Guest Role
- Mary Hon Guest Role
- Thomas Ng Guest Role
- Vincent Lam Guest Role
- Cheng Ka Sang Guest Role
- Tse Ho Yat Guest Role
Unknown
- Terrence Huang Unknown
- Bert Mok Unknown
- Edsel Chiu Unknown
- Andy Wong Unknown
- Bowie Cheung Unknown
- Jenny Wong Unknown
- Oman Lam Unknown
- Deborah Poon Unknown
- Keith Mok Unknown
- Leo Kwan Unknown
- Ball Mang Unknown
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