Fake cinderella?

Are there any drama where the cinderella is actually really rich but is thought to be poor. (I guess either because of some misunderstanding or he/she hides it for some reason or maybe he/she doesn't know because the will of some rich relative went missing but is found, or whatever...)

Thanks :D

http://mydramalist.com/9578-pleasantly-surprised
http://mydramalist.com/9220-fall-in-love-with-me

But it's the guy that pretends to be poor, and the female isn't rich.... So not really Cinderella?

I know some thai dramas that might fit, but I'm not sure you're into them:
Panyachon Kon Krua - the girl is a politician's daughter who pretends to be a servant of some rich household to do some research for her drama script
Fun Fueng - both pretend to be servants to avoid their own marriage arrangement
Sao Chai Hi-Tech - the female lead pretends to be a servant (yes, again) at the male lead's house to help him heal from his broken heart or something

Adding:
Ja Myung Go - the female lead was actually a princess but she was thrown away when she was young because of prophecy or battle for throne or something, the male lead was a prince from neighboring country

Older korean drama....but exactly what your looking for:
Glass Slippers in some instances called Cinderella Shoes.