For everyone who rather ship a Noble Lady with her Maid:

Fingersmith by Sarah Waters

The Handmaiden by Park Chan-wook (based on Fingersmith)

Sayonara Rose Garden by Dr. Pepperco

If You Can't Kill Me, Love Me by Jin (II)
https://www.reddit.com/r/OtomeIsekai/comments/1blvnmg/dont_you_hate_it_when_youre_going_undercover_as_a/