Stuck With the Protagonist

Story:

What’s so great about being the daughter of a duke anyway? As the youngest child of a crazy duke with no empathy for his kids, Elena wants to live quietly and avoid her family’s bullying. But when she ends up being followed by Sirius Hyperion, the illegitimate child of the emperor and the person foretold to bring down her family, Elena decides to sit back and watch their demise. But will sticking with Sirius allow Elena to break free from her family, or will she become one of his many victims? Original Webtoon: