The Invisible Wallflower Marries an Upstart Aristocrat After Getting Dumped for Her Sister!

Iris is the daughter of a marquess who was married off to nouveau riche, Baron Lucas, to become his aristocratic etiquette guidebook. Their relationship started as a mariage blanc, but the two find themselves slowly drawn to each other. However, one day, Iris discovers that there’s someone lurking in the shadows, maliciously trying to ruin her family, House Karelia. The perfect opportunity to convict the mastermind of his crimes is at her younger sister’s engagement party! Will Iris and Lucas successfully capture the criminal and grab ahold of their happiness?!