In the midsummer when the cicadas were noisy, Lin Weiran, always the number one in the grade, met Jiang Yi, who made "cutting classes" a daily routine. One is a top student who piles up mountains of calculation papers, and the other is a scumbag who sweats on the basketball court. They should be two straight lines that will never intersect, but they are entangled by an unexpected "help plan." In the morning light of the library, she discovered that his draft paper contained more concise ideas than the standard answers; on the street corner where the rain was pouring, he wrapped his wet shoulders in his school uniform. There is an unspoken heartbeat hidden in the summer wind, but it is broken up by the admission notices from the north to the south during the graduation season. Five years later, at the financial summit venue, he in a suit and tie passed by her in business attire, and the smell of mints entered the coffee aroma - there were some equations, and no matter how many variables were separated, there was always only one solution.