Zhang Ailing said, "The fall of a city does not mean that the love between a man and a woman has been achieved." She sneered at this sentence five years ago. Four years ago she had doubts about this statement. Three years ago she had a new interpretation of this sentence. Two years ago, she always felt that falling in love was just like what Zhang Ailing said, but her understanding has always been that "people who accompany each other choose the same city to live forever, without caring whose castle it is." A year ago, she left her hometown. "It turns out that falling in love is not about staying together forever."