A conversation of letters spanning several years about love and trust. Tan Qing and Cheng Dongyun have been childhood sweethearts since childhood. Later, a rumor spread quietly about Cheng Dongyun's mother. It was said that it was started by Tan Qing. The relationship between the two was in danger, and Cheng Dongyun dealt with it unilaterally and coldly. In middle school, Tan Qing kept counting her chance encounters with Cheng Dongyun every day. She just wanted to ask him whether he believed the rumors or her, but he couldn't open his mouth and could only silently care about him and pay attention to him. Little did she know that there was a boy named Fang Zhengyang in the corner who was also watching her silently. In the year of graduation, Tan Qing asked someone to give Cheng Dongyun a paper letter. During that summer vacation, she passed by his neighborhood every day, expecting a reply. But what awaited was silence. Many years later, Cheng Dongyun accidentally discovered the letter from more than ten years ago in the book box, as well as bits and pieces of Tan Qing's diary. Reading it again, the feeling in my heart was far different from that of more than ten years ago... He wrote in a daze - "I'm sorry, it's so late."
