Using a century-old locust tree as a matchmaker and an engraved silver bell as a letter, a young love affair during the Republic of China revealed persistence and concern spanning half a century. Su Yanzhi went north to study, hiding his longings in paintings and letters, but he didn't know that the wild geese could not reach him. Shen Nianhe sat in the old home, weaved his deep feelings into his sweater and waited, guarding the scent of locust trees alone, looking forward to returning home. With rumors blocked and mountains and seas facing each other, a pair of lovers missed half of their lives, leaving only silver bells and drawings, which became thoughts that they had hidden for a lifetime. When we meet again in old age, the old locust tree remains the same, and the scent of the locust tree remains the same. Although it is difficult to make up for the missed time, the warmth of staying together is enough. Then four generations of the Su family took over the task of guarding the old locust trees, passing down stories, and passing on their deep feelings, turning the private obsessions in the small courtyard into the cultural imprint of the entire town. From the Republic of China to the present, from deep love to generational inheritance, the sweet and sad past, and the warm and healing present are all hidden in the lingering scent of locust trees and the crisp ringtones. Reading is full of emotion and peace of mind.