She left, as if she had never been here. She erased all traces of herself, but she couldn't erase the memories. Xu Yun had never expected these four years, and she didn't know how Liu Xiyan would judge these years in the future. Will they be unforgettable? Is it youth and ignorance? Or never mention it again. Xu Yun thought that he would have to leave one day, because this small town was so small, and any place could remind him of Liu Xiyan, and the memories were so long.