The secret service has been responsible for protecting the Emperor for generations and 12 agents are always assigned to bodyguard duty. Amongst the current group, Zero Zero Dog (Louis Koo) is considered to be the weakest as he shows no interest in the martial arts and spends his time studying technology and creatng inventions. When Dog stumbles upon an evil plot to kill the Emperor by the chief eunuch, Cao Yan Chui (Fan Siu Wong), he decides to prove everyone wrong and vanquish the enemy himself-http://www.hkcinemagic.com/en/movie.asp?id=10933