sORRY i DON'T KNOW THE ENGLISH TITLE.-

Challenging, this one !
The opening page indicates Shanghai, so most probably a Mainland China production.
Nothing found for the title, director or lead actors on hkmdb.

Do you have a year of production ?

When you have a movie with credits written with brush, or written in simplified, the best thing you can do is search its chinese title in the Net... sometimes you can find the complete cast/crew somewhere!

The english title is "The Little Black Box" (1986)

Added movie, prod. company, dir., writer, action dir., assist. action dir., phot., mus., ed., art dir., costumes, sound and 12 actors.