Bona, the youngest daughter of the Y Group, embodies beauty, wealth, and grace. Despite having it all, she’s harbored a 14-year-long crush. Her commitment to her figure, maintained by daily strawberry milk consumption, stems from a childhood promise of marriage with her crush. Finally confronting her unrequited love, she’s met with his continued perception of her as a child. Frustrated, she challenges his view, emphasizing her mature attributes. Bona’s journey into her 19-rated obsession with Eunho, a paragon of diligence and thriftiness, begins, leaving Eunho bewildered by her unexpected actions.