I Heard My Lovely Sister-In-Law's Engagement Was Broken So I'm Going to Show Them My 'Thanks!'

Roselia is widely regarded as the most gifted young woman in the kingdom, celebrated equally for her brilliant mind as a scholar and her formidable prowess as a fighter. Beloved by all who know her, she stands at the altar on what should be the happiest day of her life: her wedding to Robert, the head of a ducal family and her cherished childhood friend turned lover. The ceremony proceeds joyfully, with guests offering their heartfelt congratulations, until the celebration is shattered by an unthinkable interruption. Robert’s younger sister, Margaret, is suddenly brought into the venue in a battered and tattered state. Margaret had been attending the prestigious Royal Academy and was engaged to the crown prince. However, the prince abruptly annulled their engagement by falsely accusing her of a crime she never committed, subjecting her to brutal violence before discarding her. This cruelty strikes a deep nerve, as Margaret had long dedicated herself to quietly resolving the prince's reckless mistakes behind the scenes. Consumed by righteous fury over the royal family's disgraceful treatment of her new sister-in-law, Roselia faces a daunting choice. Will she dare to challenge the corruption of the royal court directly to protect the girl she now calls family?