In The Line of Duty 4's cast and crew
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Full Cast
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Cynthia Yang Li Ching
(Insp Rachel Yeung Lai-Ching)
Donnie Yen
(Captain Donnie Yan)
Michael Wong Man-Tak
(Captain Michael Wong)
Simon Yuen Yat-Choh
(Luk Wan-Ting)
Lisa Chiao Chiao
(Luk's mother)
Wai Gei-Shun
(HK Police officer)
Sunny Yuen Shun-Yi
(Drug dealer)
Michael F. Woods
(Black fighter on rooftop/motorbike)
John Paul Salvitti
(Fighter in alley)
Stephen Berwick
(Fighter on motorbike)
Fairlie Ruth Kordick
(Blonde fighter)
Paul Wong Kwan
(Killer at hospital)
Eddie Edvardo Maher
(Loan Shark in Seattle)
Liu Kai-Chi
(Ming)