Seventh year of the reign of Emperor Wangli from Ming Dynasty. Nobles from the ancient city of Yuyang conspired to join forces with foreigners to usurp the throne. And only a petty gangster Lan Yu is able to save the ruler.

The story revolves around the World's Best Matchmaker, Young Master Wuji, who boasts a stunning face and a jade-like voice, and the bold and decisive No. 1 Pretty Lady, Tang Xiaolu. They accidentally meet during the Marital Festival and end up getting engaged. Together, they unravel the mystery of their identities while deeply in love. However, all of these turn out to be a scheme within a scheme, a play within a play, orchestrated by others.

Ming Dynasty secret agent Ling Ling Ling (000) is assigned to investigate a drug poisoning involving a performance enhancing drug in the brothel, Ying Chun Kwok. Ling thought hard and finally came up a disguise as the author of Yuk Po Tuen (Sex and Zen) to sneak into the brothel. The prostitutes in order to get their names into the book all tempted Ling, who in order to appaise the ladies, turned the book into a book of dirty stories. One day, a blind servant Yuk Chu Nui (Jade Virgin) is auditioned, Ling learned that the buyer would receive the drug, so he bidded up the prices hoping to receive the evidence. Who would expect that someone else is bidding with a higher price?

An imperial agent gets ridiculed for his various inventions, until his supportive wife encourages him to attend a conference, which's actually a trap to kill all the doctors serving the emperor, where his crazy inventions come in handy.

Louis Koo plays 009, or translated literally from its aural pronunciation, double-O Dog. He's one of 12 special Royal Bodyguards of a simpleton Emperor (Liu Yiwei) who named these 12 guards after the Chinese Zodiac, hence 9 translated to Dog. Unlike his peers, Dog is a scientist, and relies pretty much on his brains and fantastical gadgets to protect his Majesty from evil ninja assassins.