The Penultimate Heartbeat Note

There are two major unsolved mysteries in Xia Xiaoyu's high school life: One is why her math scores always stay on the edge of the passing line, and the other is why Jiang Yi can always accurately catch her flying eraser. As the only student in the class who can turn "morning self-study" into "sleep time", there is a locked notebook hidden in her desk - there are no formulas and theorems in it, only fragmentary thoughts about Jiang Yi: "When he bent down to pick up a pen today, his exposed wrist was straighter than a ruler." "In the physics experiment class, his fingers that were holding the test tube for me were shaking." "After the monthly exam, he put the wrong question book on my desk. The title page said, 'Write down all the steps.'" She thought that the heartbeat hidden on the back of the draft paper would never be seen in the light like her scores, until one day on duty, she found a drawing in Jiang Yi's textbook - a drawing of her profile sleeping in class, with a pencil mark next to it: "The 17th time I dreamed of eating ice cream." It turns out that some heartbeats never require standard answers, just like the book of wrong questions that came last was filled with the courage to rush to the top.