The Heartbeat Delay Theorem: the Slow Heartbeat of a Top Student

**Introduction to the work "Cardiac Delay Theorem"** When Yushu, a chatty academic student, met Jiang Ci, a reserved academic master, she thought that this secret love was destined to end in vain. Until the day when she changed classes, she secretly stuffed a rabbit eraser into the gap of his desk, marking the end of this grand secret love. But that night, a message popped up in the chat window that had never taken the initiative: "Do you still want your physics notes?" She replied angrily: "No more." After a moment of silence, he sent a photo - it was the eraser, lying quietly in his palm. "What about this? Do you want to take back the things you left behind?" From that day on, the two worlds began to quietly intersect. The setting sun in the library, the chance encounters in the second-hand bookstore, the late-night voice calls... These unspeakable heartbeats are hidden in every math problem he taught. Until the end of his senior year in high school, he stood at the door of the liberal arts class, holding an eraser in his hand and the tips of his ears turned red: "Yushu, I seem to have left something behind too." "What?" "Heart." This is a heart-warming story about a top student and a bad student, from deskmates to lovers, from youth to maturity. The theorem may be delayed, but the heartbeat is never absent.