Princess Agents- historical chinese drama, FL is a slave
Bloody Romance- historical chinese drama, FL is sold by her father into a brothel
Story of Ming Lan- historical chinese drama. Not technically poor or a slave but she's an illegitimate child and has been through some shit
My Huckleberry Friends- modern chinese drama, FL is poor and has a lot of family struggles
I Will Never Let You Go- historical chinese drama, FL is a beggar. Warning though: about the last ten episodes or so suck complete ass. Was pretty solid up until then though.