"I need you. Will you marry me?" Esther, the daughter of an earl, is shunned by her family as an "unlucky young lady" who brings misfortune. Esther had given up everything and was living a quiet life, when suddenly, Louis, the "lucky prince" beloved by everyone, proposed to her. Esther was confused by his sudden proposal, and Louis told her, "For the sake of the country, I want you to play the role of my wife for just one year." This was a limited-time contract marriage, with a divorce after one year. Their married life was supposed to begin with that promise, but... the prince is too sweet!? A heart-fluttering love story begins with a mysterious marriage between a lucky prince and an unlucky young lady.