Seven-year-old Su Nian made a childhood vow with ten-year-old Gu Huaijin under the plane tree, "You protect the world, and I will protect you." When he was twelve years old, the Gu family suffered a sudden change and the whole family moved. The two were separated in a heavy rain, and they have been separated for many years. At the age of twenty-two, Su Nian became an emerging designer. At a bidding meeting, she reunited with Gu Huaijin, who had become a technological upstart. However, he was indifferent and alienated from her due to family trauma. The two were repeatedly involved in business cooperation and emotional testing. When Su Nian thought that love had finally returned, Gu Huaijin chose to "betray" and leave again to protect her. At the age of twenty-eight, when Su Nian learned the truth about Gu Huaijin's disappearance at the peak of her career, she resolutely dropped everything and traveled halfway around the world, using their shared memory and perseverance to complete a two-way journey and ultimate healing that spanned twenty years.
