For Infernal Affairs III, Andy Lau reprised his role as a triad member who has infiltrated the Hong Kong police force, trying to exorcise the ghosts of his criminal past in Lau's first emotionally troubled role.
劉德華在片中續演急欲徹底漂白的黑道警察，首度嘗試精神游離的反派角色，有許多內心掙扎戲，拿捏得宜。