I Became the Duke’s Servant in Disguise

She reincarnated in the body of a maid who gave her heart and body to the villain duke and died while using it. Roselia, originally a maid of the Duke's family, is destined to be found and executed by the male lead, the Crown Prince, while being used as the Duke's chess piece. So she decides to dress as a man to avoid being noticed by the villain duke. Oh but why...!! Did you take me even though I'm dressed like a man?! Why did she become a servant instead of a maid to the Duchy? Source: MU Includes 15 extra chapters.