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The whistle has sounded, and the couple outside the window are still inseparable. I don't know what the girl said. The elegant man wearing gold-rimmed glasses curved his mouth into a nice arc, kissed the girl's forehead, and turned around to get on the train. Seeing the girl's eyes full of reluctance, Shang Ling found it interesting, so he leaned against the window with his chin in his hand and watched as much as he could. What a coincidence, the man was sitting opposite her, and when he saw Shang Ling, he nodded politely and gracefully. After sitting down, he turned to look out the window. The train moved slowly, passing the blue stop sign. Following the man's gaze, the girl on the platform started running slowly following the train. Shang Ling looked at this and that, feeling sour and sweet in her heart. She thought of her long-legged brother, the brother who climbed up the plum tree to pick plums for her.