Felix Wong
Felix Wong portrays Shek Tung-sing (石東昇), nicknamed Stone Sir, one of the story's main protagonists. He was framed for murdering a defendant lawyer and his wife fifteen years ago, and was sentenced to a lifelong jail term. He later discovers a piece of key evidence while reading a magazine article written by Kim, and is later released from jail. He reunites with his wife and daughter, but their relationship is estranged. He returns working as Team A's Sergeant led by Mad Sir.