My Wife Is 18 (simplified is a 2002 Hong Kong comedy romance film directed by James Yuen Sai-sang (阮世生). A prequel to My Sassy Hubby (2012). The key casts are Ekin Cheng Yee-kin (鄭伊健) as Thirteen Cheung Sap Sam, Charlene Choi Cheuk-yin (蔡卓妍) as Yoyo Ma Suk-ling and Bernice Liu Bik-yi (廖碧兒) as Miss Lee.
In order to appease their mothers, 30-year-old Thirteen is getting married to 18-year-old Yoyo in London. Yoyo returns to Hong Kong to study and Thirteen continues his work in London. The marriage is kept a complete secret. But things become complicated when Thirteen returns to Hong Kong looking for work, and winds up teaching at Yoyo's School. Although Yoyo is enraged, she still keeps their secret. As the one-year mark of their marriage approaches, will the love in their hearts overrule their urge for divorce?
