What's Wrong with Being a Femme Fatale?

Which prestigious family doesn't have a down-on-her-luck cousin living under its roof, looking delicate and pitiful while secretly harboring big ambitions? A Luan is just such a cousin in the Duke of Anguo's household. She is born with exquisite features, a slim waist and full hips, and breathtaking beauty. The old madam dotes on her, but the wives of the various branches watch her like hawks, fearing that her bewitching charms will ensnare their sons and make them lose their heads, forcing them to marry a penniless beauty and ruining their prospects. [The blurb has been screenshotted] Theme: Live well~