**"Steal Diello Arzenta’s purity through deception."** That was the vile order delivered by Duke Alore, a contemptible father, who carved the enemy's name into his own daughter's back. The protagonist awakens in the body of *Crua Alore*, a villainous extra from the R-rated tragic novel *The Three Ducal Houses*. Disguised as the fake fated partner or *Pheró* of Duke Diello Arzenta, she is tasked with infiltrating and ultimately destroying the House of Arzenta. But determined to escape the cruel fate laid out in the original story, she makes a bold choice: **"Let’s get married. For just one year."** Bound by mutual interests, the two enter into a contract marriage. Together, they put on a convincing show of passion, all while working to secure Arzenta’s safety. Yet when the year draws to an end, and Crua prepares to leave— Diello reveals a side of himself she never anticipated. **"I thought you were clever... So how is it that you only see one side of things?"** Can Crua escape from Diello’s tender yet unyielding obsession?