Sunny

He worked as an undercover agent for the Red Flower society under Leung's direction and was a burlesque dancer for NASA.
He became popular as a dancer, and since he was not likely to return to the police force, he spent his days indulging in drugs obtained by Ti Wai, who was in the same situation.
His fate changed when Ti Wai murdered his colleague dancer Panther's girlfriend, and he was able to return to the police force.

After returning to the police force, he devoted himself to the pursuit of corruption within the police force and leaked Chief Superintendent Lee's misconduct to the press.
He also informed Yvet of Lee's plan to assassinate Yvet.