Thirty-five years ago, He Yuanzhou, a boy from a remote mountain village, walked fifteen li along a mountain road to register at No. 1 Middle School. His family could only scrape together 24 yuan, leaving him short of half his tuition and facing the prospect of dropping out. At Anping Ferry, amid the endless autumn rain, Su Maimiao saw him shivering in his thin clothes. She draped her father's old black leather jacket over his shoulders and secretly paid the remaining 24 yuan of his tuition at the registration office, saving his chance to continue his education. During high school, they became deskmates and supported each other. On the school playground, He Yuanzhou made her a promise: no matter where Su Maimiao might be in the future, he would surely return to find her.