In the new film, two officials in ICAC — once a couple, now but separated — team up to find a missing witness who is the key to cracking a big bribery case. However, the mission begins to unravel a more thrilling truth, one which will reveal the true identity of the witness.

The star-studded cast also includes Chinese Canadian actress, Karena Lam, who plays one of the officials.

"Nick has made huge progress in his career over the past five years. He is not only an actor but also a director now," said Sean Lau during a promotional event in Beijing on Nov 26.

The star added that he hopes the film will raise public awareness about the necessity to crack down on corruption.