Konyaku Haki Reijou no Kareinaru Tenshin

Having lost everything—her engagement broken off due to the prince's infidelity, and her family unjustly disowning her—Marquis's daughter Iris meets Evan, a wealthy merchant with striking looks and an enigmatic charm. He recognizes her talent as a designer, and Iris becomes engrossed in what she truly wants to do: dressmaking. As they spend time together, Evan's passionate gaze and sweet playfulness make her heart flutter with longing... "Shall I take your lips like that night?" The magnificent reversal of fortune love for "designer's daughter" Iris begins!

(Source: AlphaPolis, translated)