The story of nine years, from the explosive oath of love in ignorance, to the changes in each other's lives in the past nine years, separation and reunification, she is not as proud and arrogant as before, and he is not as young and frivolous as before. He has been with her friends, and she almost slept with his friends, but the two parties have never left each other's lives. Time is the medicine that heals everything. This is a story about growth. May the days ahead be like the summer when you first met, with sunshine always shining.