Before You Discard Me I Shall Have My Way vol 1 back

A ruthless romantic drama about noble politics, scorned lovers, and revenge. Agnès, the daughter of a duke, is in love with crown prince Lucilleur, the man she's been betrothed to since they were both children. But before they can wed, Agnès is hit with a bombshell: Lucilleur doesn't return her feelings and wants to break their engagement so he can marry his true love, a different noblewoman with a sweet and innocent demeanor. Agnès is more than just heartbroken-she's angry. Her 'sweet' rival might not be sweet at all, and her beloved prince has wrecked her future. This means war... both in politics and in bed.