I just discovered that Maan Lee-Hung and Fanny Fan Lai are one and the same. Maan Lee-Hung was her name when she started out acting in the Cantonese division of Shaw Brothers before moving over to the Mandarin division.

Maan Lee-Hung
http://hkmdb.com/db/people/view.mhtml?id=2636&display_set=eng

Here is the proof at HKFA:

Fan Lai filmography
http://ipac.hkfa.lcsd.gov.hk:80/ipac20/ipac.jsp?npp=10&ipp=20&profile=hkfa&aspect=basic_search&term=Fan%2C+Fanny%2C+1940%2F10%2F16-&index=NAMEBRP&uindex=&oper=&ri=2&session=V1O8932I49616.254&menu=search&aspect=basic_search&npp=10&ipp=20&profile=hkfa&ri=2&source=192.168.110.61%40%21horizon&sort=3100083&go_sort_limit.x=9&go_sort_limit.y=9&limit=

A Pretty Girl's Love Affair entry showing "Man Lei Hung (aka Fanny Fan Lai)"
http://ipac.hkfa.lcsd.gov.hk:80/ipac20/ipac.jsp?session=V1O8932I49616.254&profile=hkfa&uri=full=3100024@!38928@!1&ri=2&aspect=basic_search&menu=search&source=192.168.110.61@!horizon&ipp=20&staffonly=&term=Fan%2C+Fanny%2C+1940%2F10%2F16-&index=NAMEBRP&uindex=&aspect=basic_search&menu=search&ri=2

Fan Lai's bio from the Celestial DVDs also mentions this, but gives her earlier name as Wan Li-Hong.
http://hkmdb.com/db/people/bio.mhtml?id=2818&display_set=eng

I'll merge in a couple days.

Thanks Dennis! As a Fanny Fan fan , I was quite pleased by this discovery.

Maan Lee-Hung

Crime of Passion in the Hotel (1958)
A Pretty Girl's Love Affair (1958)
A Virtuous Girl From a Humble House (1958)
Behind the Hidden Scene (1959)
Oriole, the Heroine (1960)

merged with Fanny Fan Lai

http://hkmdb.com/db/people/view.mhtml?i ... ay_set=eng

...also added a few more Cantonese credits listed at the hkfa.