At eighteen, Lin Xin once thought that she would walk into the same city and the same future with Jiang Xu. She changed her college choices three times for him, checked the weather, calculated rent, and planned life, only to find after being ignored time and time again that Jiang Xu had long given his partiality and care to another girl. Thus, she re-selected Beichuan, rushing alone toward a life belonging to herself. Until she truly left, Jiang Xu finally understood that the girl who had always been quiet, sensible, and would not make things difficult for him would also have a day when she turned around. Midsummer ends, and they finally walk toward different lives.