The story takes place in the early 1970s. Kim Yoon-hee is a shy girl who is a student at a prestigious university. Raised by her grandmother, she has always been lonely, and her only friend is her diary. One day, she meets Seo In-ha, who quickly falls in love with Yoon-hee. However, their love is not meant to be, and they are separated by fate. Many years later, their children meet. Seo Jun and Kim Ha-na are nothing like their parents, but they also fall in love. Will they be able to be together, or will they face the same fate as their parents?