Liu Yue Ping reports to the ICAC about a rich 2G Cao Yuen Yuen who bribed officers of the Hong Kong Correctional Services (HKCS) from inside the prison. William Luk decides to infiltrate the prison as an inmate to conduct his investigation, while his partner Ching Tak Ming and Chief Inspector Lau Po-keung back him up from the outside.
古天樂
as William Luk
鄭嘉穎
as Ching Tak-Wing
林峯
as Tso Yuen-Yuen
林家棟
as Wong Man-Ban
周興哲
as Natalie Liu
張繼聰
as Wong Lam-Luk
張智霖
as Lau Po-Keung
譚耀文
as Sum Kwok-Keung
陳靜
as Donut
BabyJohn Choi
as Cel
廖啟智
as Yiu Kwan-Ho
艾威
as Chin Kwok-Fung
