Lin Xiaoxia is a cheerful and lively high school student. On the first day of school, she bumped into transfer student Gu Yan in a hurry. The two met unhappily for the first time. Gu Yan looks cold and has excellent grades, but he hides a complicated family background in his heart. After becoming tablemates, Lin Xiaoxia's warmth gradually melted Gu Yan's indifference, and the two of them grew from strangers to familiarity, and gradually developed feelings for each other.
However, misunderstandings and challenges ensued. Lin Xiaoxia mistakenly believed that Gu Yan was having an affair with the school beauty Su Qing, and felt disappointed; Gu Yan's mother opposed their relationship and believed that Lin Xiaoxia was not good enough for him. Faced with family pressure and academic pressure, Gu Yan firmly chose Lin Xiaoxia, and the two agreed to work together to get into the same university.
After taking the college entrance examination, Gu Yan had to go abroad for further study due to family changes, and the two began a long-distance relationship. Even though they are thousands of miles apart, their relationship grows stronger. A few years later, Gu Yan returned to China and proposed to Lin Xiaoxia. The two finally got married and spent a lifetime together.
The story is set on a youth campus, showing the growth process of Lin Xiaoxia and Gu Yan from youth to maturity, as well as their choices and persistence between love, family and future. The first meeting that summer became the best memory in their lives.
Mission: Youth, growth and persistence