Lin Zhi, a freshman at Nancheng University, ran into the arms of Jiang Xu, a senior and teaching assistant in the Department of Computer Science, on Wutong Avenue in September. One is a Jiangnan girl who is used to hiding her worries in novels and films, and the other is a science and engineering man who talks about finding it troublesome but always approaches her first. From the window seat on the third floor of the library, spicy hotpot in the cafeteria, to the first snow on the playground, and the graduation flea market; from youthful crushes, jealous cold wars, to cohabitation internships, and family pressure; to exchanges in foreign countries, working in different places, and campus proposals. They were separated by reality more than once, but they could always hold each other back when the sycamore leaves fell.