The Witness

Main Role

• 
  Him Law

  Ko Lik Kei / Ah Kei /"BB"

  Main Role
• 
  Kelly Cheung

  Lee Chung Ying / "Chris"

  Main Role
• 
  Willie Wai

  Lee Ho Fan / Fan Gor / Ah Fan

  Main Role

Support Role

• 
  Pinky Cheung

  Ko Wing Yam / Miss Ko [BB's elder sister]

  Support Role
• 
  Tsui Wing

  Yip Ming Kwan /" Gordon" [Yip San's son]

  Support Role
• 
  Lau Kong

  Yip Cheung Lok / Yip San [Gordon's father]

  Support Role
• 
  Sammi Cheung

  Dai Bik Kei / "Yuki" [Lik Kei's girlfriend and Chung Ying's rival]

  Support Role
• 
  Geoffrey Wong

  Wan San Wai / Wan Sir [BB's boss and Police]

  Support Role
• 
  Kiwi Yuen

  Lui Lai Yiu / Ah Yiu [W's New representative and right-hand man]

  Support Role
• 
  Helen Ma

  Cheung Sau Chun / Chun Po /" Rosa" [Lai Yiu's mother]

  Support Role
• 
  King Lam

  Kam Chi Sing/" Jason"

  Support Role
• 
  Milkson Fong Support Role
• 
  Cheung Sze Yan

  Yam Pui Lin / "Jacqueline"

  Support Role
• 
  Nicole Wan

  Tam Siu Fa / Fa Jie

  Support Role
• 
  Burmie Wong

  Ko Tai Tai

  Support Role
• 
  John Chan

  Lee Kai Je

  Support Role
• 
  Janice Shum

  Ching Yuet Ming

  Support Role
• 
  Shally Tsang

  Liu Suet Mui

  Support Role
• 
  Ng Pui Yu

  Lau Hiu Yan

  Support Role
• 
  Martin Tong Support Role
• 
  Louis Szeto Support Role
• 
  Kimmi Tsui Support Role
• 
  Lo Jun Fung

  Se Wong Bing

  Support Role
• 
  Siu Lai Man

  YanYan

  Support Role
• 
  Chun Kai Wai Support Role
• 
  Chiu Lok Yin Support Role
• 
  Chan Min Leung Support Role
• 
  Man Yeung Support Role

Guest Role

• 
  MoMo Wu

  Sa Dam Jie (Ep. 7-8, 10, 12)

  Guest Role
• 
  Oman Lam

  [W and Sa Dam Jie's helper] (Ep. 7-8, 10, 12)

  Guest Role
• 
  Bobo Yeung

  [Feng Jie] (Ep.1-2)

  Guest Role
• 
  Eric Chung

  [Evaluator] (Ep.3)

  Guest Role
• 
  Doris Chow

  [Psychologist] (Ep. 5,11)

  Guest Role
• 
  Osanna Chiu

  [Jue Hok Yan's wife] (Ep. 8)

  Guest Role
• 
  Miguel Choi

  [Doctor] (Ep.16-17)

  Guest Role
• 
  Dolby Kwan

  [Cafe Waiter] (Ep.1,4-5,11,13,17)

  Guest Role
• 
  Yuki Law

  [Coffee shop employee] (Ep. 15)

  Guest Role
• 
  Jacky Lee Guest Role
• 
  Alan Tam Guest Role
• 
  Felix Ng Guest Role
• 
  Wong Wai Tong Guest Role
• 
  Tony Chui Guest Role
• 
  Janice Pang Guest Role
• 
  Lucas Yiu Guest Role
• 
  Thomas Ng Guest Role
• 
  Ball Mang

  (Ep. 2-5, 7-9, 17)

  Guest Role
• 
  CC Cho

  (Ep. 1-2)

  Guest Role

Bit part

• 
  Jim Tang Bit part
• 
  Danny Lo Bit part

Unknown

• 
  Marktwo Lee Unknown
• 
  Keith Mok Unknown
• 
  Jenny Wong Unknown
• 
  Bert Mok Unknown
• 
  Sandy Leung

  (Ep. 18-19)

  Unknown
• 
  Miumiu Au Unknown
• 
  Andy Lin

  (Ep. 17, 20)

  Unknown