Sarajil Hwangnyeoreul Wihayeo

You’re saying that I, a barmaid who grew up on the streets, might be the princess…?! After pawning off a necklace, Sasha finds herself embroiled in a game of politics and enters the Imperial Palace as the long-lost Princess Anastasia. The secretive romance between Sasha, a shrewd and daring back-alley-raised “princess,” and the stern Duke Lascan, fiancé to the missing princess who vows to stay by Sasha's side, unfolds!

(Source: WEBTOONS)