Ansia, a former wartime nurse, accepts a strange marriage proposal ad due to her debt and poverty, and heads to the advertiser’s house. The only condition for marriage: to bear a healthy child. Surprisingly, the man behind the ad is none other than the war hero, Duke Bellados. But instead of the duke, a mysterious man named "Al" appears and tempts her, claiming they must go through a preparation period before meeting the duke. He insists it's on the duke’s orders... As Ansia is tamed by Al through their physical relationship and begins to fall for him, she comes to learn the shocking truth: “Were you deceiving me all along, Your Grace?” Al was actually Duke Bellados himself—the man behind the ad! Though enraged by the deception, Ansia is swayed by his sincere apology and continues with the contract marriage. But over time, things start to feel… off. Why does he love her? What is he hiding? Am I even allowed to be this happy...?