Sassy and bratty Historical Female Leads?

I want the type of historical heroine that has no manners at all, doesn't care about what the high ranking elite thinks of her (she has to learn the rules from the beginning and etiquette), either because she rose from a commoner's rank to a nobility's or a scholar's, or because she discovered she's a illegimate princess, story lines like Princess returning Pearl,  My bratty Princess, Princess Huai Yu. I didn't like the "Imperial doctoress" or "Female prime Minister" that much, because she wasn't sassy or bratty enough. But because of her purity of heart, she captures a royal's heart. Someone really sassy and bratty more like My bratty Princess. I watched all the spinoffs from "My bratty Princess", or "Princess returning Pearl". No time traveling this time. She's pure at heart, has no cruelty, is kind at heart, and that's why the royal man (or men) love her. The legend of Zhen Huan has too much political and palace intrigue. So nothing too historical, just some historical spoofs (not real history). Princess returning Pearl 1 and 2 are my absolute childhood favorites (watched them all when I was around 10 years old) I still re-watch them from time to time for old times' sake. 

 Knavery:

Perfect Couple has a lead that's... lets call her undignified.

King is Not Easy - there's a body swap and like a lot of Chinese webdramas things get crazy at about Episode 16 when they didn't need to. But she's not afraid to voice her opinions to anyone who will listen.

How about if she's already noble?

 Female Assassins in the Palace has a bratty lead.

And if we want to go off the board here we could look at Hong Kong Dramas:

Can't Buy Me Love - arrogant princess marries a gold merchant 

Queens of Diamonds and Hearts - a woman with a birth mark marries the king/emperor and he also takes a maid he's infatuated with as his wife. "Ugly" birth mark woman he's forced to marry saves his ass and kingdom countless times before he finally realizes "oh I like her".

I don't really like it when she's already a noble. I love it when it's because of her commoner's rank's that a royal man falls head over heals with her. (In princess returning pearl, she fakes being an illegitimate princess, in My bratty Princess, they (the Emperor and the Prince) don't know her real rank because she disguises herself as a commoner. In Princess Huai Yu, she also disguises herself as a boy and a commoner and meets the Emperor Kang Xi.

The heroines in these dramas aren't exactly "bratty" (I'm guessing these all fall somewhere in between exactly what you're looking for and personalities that are more like the FL in Imperial Doctress), but they are sassy, clever, confident, and generally don't care about making a good impression on the nobles.

• Sound of the Desert - the FL was originally raised by wolves, so certainly not a demure noble girl
• Princess Agents - I have to include my usual disclaimer that it ends with a tragic cliffhanger and there may not be a second season
• Love in the Moonlight - this one starts off very funny and carefree, but turns more serious / sad later on and the FL also goes from funny / sassy to more serious as the story changes; (that makes it sound like a complete tragedy but it has a relatively happy ending)
• Maybe Empress Ki - this wasn't personally my favourite, but the FL is pretty great in the beginning and definitely doesn't care what the prince thinks of her at first; warning from what I can remember it included a heavily implied rape scene and ended tragically

EDIT: RE Sungkyunkwan Scandal, she's definitely not bratty and she sometimes cares about what the nobles think of her (she's secretly cross-dressing as her brother so she can work / be a scholar, and from an impoverished / disgraced household), but she's clever and usually upbeat and brave. I don't recall a prince falling in love with her, but she does have several noble male friends and romantic interests among her fellow scholars including the son of the prime minister if I remember correctly. 

If I read your request correctly, you don't want dramas with time travel. If that's not the case, you can also try:

• The Eternal Love - FL is a modern day real estate agent, totally confident, sassy, and not concerned with what the nobles think of her + has to learn the etiquette of the time
• My Only Love Song - she's probably the only FL that can be described as bratty in this list
• Splash Splash LOVE - definitely not concerned with protocol / what the nobles think of her

My Sassy Girl with Oh Yeon Seo.

HOWEVER, about halfway through the writing/show becomes more about politics and Female lead becomes less "sassy" and more on the crying/melo side :(