After falling in love with genius programmer Jeon Jungkook, Y/n gets into the school he once studied at, and also took up the same calculus major. Setting Jeon Jungkook as her role model in her heart, she achieves good grades in school. However after graduation, she did not expect that Jungkook' s company does not recruit female employees. Y/n decides to disguise as a man and enter the company. However, she met difficulty both in work, as well as hiding her identity. Finally with her perseverance, she grabbed hold of an opportunity and managed to come to an agreement with Jeon Jungkook. The two would become a "contract couple" and stay together for one year. Slowly, Jungkook finds himself falling for Y/n.