Elio, a country count's daughter, gets caught up in her father's scheming plot to seduce a young duke.

Without even laying a finger on him, she overnight becomes a "trashy young lady" who allegedly assaulted the imperial princess's fiancé.

However, instead of setting the record straight, the young duke fans the flames of the scandal. To help Elio escape her abusive father, he proposes a deal: pretend to be his fiancée for three months.

Thus begins their fake engagement. The only problem is that she keeps getting shaken, as if it were all real.