In the old Dongguan courtyard of the 1980s, a locust tree witnessed the childhood romance between Chen Wang and Lin Xiaoman. The two once sat side by side on a millstone to do their homework, and once promised to see the blue sea together. The sweet fragrance of locust blossoms held their innocent, tender bond. To fulfill his wish of letting children from the mountains see the world beyond them, Chen Wang resolutely set off for Daliangshan to teach. He packed twenty-four letters filled with longing into an iron box and left it for Lin Xiaoman. From then on, mountains and seas lay between them. Deep in the mountains, he taught children to read in an earthen house, surrounded by vivid Soma flowers, and told them about the distant sea. In her hometown classroom, she kept the letters in the iron box, turning her longing into exercises written with her pen as she waited to keep their promise to see the sea together. The mountain roads wound on, and the letters passed from hand to hand. Time slipped quietly by as the locust blossoms came and went and the Soma flowers bloomed. Chen Wang used his youth to kindle the mountain children's dreams of learning, while Lin Xiaoman grew into an independent, resilient woman as she waited. Though separated by countless rivers and mountains, they made their letters a bridge, turning a youthful promise into a profound love and a shared sense of duty that spanned mountains and seas.
