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.

Stephen Chowas Ling Ling Fat
Carina Lauas Ling Kar Ting
Carman Lee Yeuk-Tungas Kam Tso
Law Kar-Yingas Fat Yan
Cheung Tat-Mingas Emperor
Tats Lau Yee-Tatas Forbidden City Cop
Lee Lik-Chias Court Official
Alvina Kong Yan-Yinas Dizzy Patient
Kingdom Yuen King-Tanas Brothel Procuress
Mimi Chu Mai-Maias Fat's Mother-in-law