Description：In the solemn palace, twelve secret agents named after their zodiac signs are tasked with protecting the emperor closely. Among them, Gao Tianjiu, nicknamed "Lingling Dog" (played by Louis Koo), is an inventor with a head full of whimsical ideas. He has repeatedly made great achievements in protecting the emperor with various "magic weapons", but the reaction of "Lingling Dog" to the infatuation of his amorous but highly skilled fiancée Mei Xiwang (played by Big S) is quite dull. In order to make this "Lingling Dog" come to his senses, Mei Xiwang came up with a way to test "Lingling Dog". It is difficult to distinguish between loyalty and treachery in the deep palace, and murderous intentions are hidden. Around the issue of the princess's selection of a consort, forces from all sides secretly colluded in an attempt to seize power and usurp the throne and eliminate the secret agents headed by "Lingling Dog". The safety of the emperor is threatened, and the twelve agents face unprecedented challenges