Roxana (2021)

Blurb:
Kidnapping, murder, and risqué relationships! Within the scandalous pages of “The Abysmal Flower”, the downfall of Roxana Agrece’s criminal family is already foretold. So when Cassis Pedelian, the heroine’s older brother, is kidnapped by Roxana’s father, she can either wait for the heroine’s revenge … or take matters into her own hands, since Cassis is the key to her survival. But with deceitful characters on all sides, can Roxana and Cassis trust each other enough to bring down the brutal Agreces?

Source: www.anisearch.com/manga/60778