​An aspiring musician, Sejin says she gave up music, but she still sings at jazz bars on weekends. Yeo-Ne While singing as he does on weekends, he runs into Eun-young, the best friend of his ex-girlfriend Min-kyung. Out of the blue, her guitar He reluctantly accepts her offer of guitar lessons, but the more time he spends with her, the closer he finds himself to her. As his feelings for Eun-young grow, he cautiously confesses his feelings, but is shocked by what she reveals.