Undercover police officer Yu Chau (Nick Cheung) has successfully apprehended many criminals in the city of full of evil. Because a child abduction case, Yu's identity is starting to be brought to light, attracting the hunt from criminal groups. In order to adhere to justice within his heart, Yu does not hesitate to risk his life to start a life and death battle of wits against the leader of the mysterious criminal group.
The Trough
An undercover police officer's identity is exposed when he takes on a child abduction case.
