Bong has mentioned several, and the most obvious is Kim Ki-young's 1960 film The Housemaid, which features a similar story about a poor maid infiltrating the rich.
If I was lucky, I would've been thrown in the Tower of London. If I was unlucky, I probably would've ended up a scullery maid. What a dream that I've just destroyed for myself!
Like all other animals in the world;cows, horses, pigs - they don't have, like, vacuum cleaners, or maid service, or really anything, and their place is really dirty.