The drama is adapted from the novel "Spring Breeze and Human Ballads" by the best-selling author Wen Jier, and "The Promise to Grow Up Together" is the key chapter of the book. The ordinary girl Xia Mi accidentally got admitted to the key No. 1 Middle School in the city. By chance, she met the sunny and outspoken boy Zhang Ruoxi, the calm and rational academic master Fan Yuan, and the beautiful and friendly top student Lin Ruolei. The four people with different personalities encouraged each other and bound each other in the process of pursuing their dreams. They made a promise when they were young together and realized their own growth and transformation in the process of pursuing their dreams.