Shen Changan ran back to Teacher Yao’s house and saw that he was holding a letter. The envelope was a little yellowed, looking like it had been kept for a very long time.
"There’s something… I wanted to tell you when you came to see me two years ago, but at that time you were busy preparing to participate in a competition, and I was afraid this matter would affect your performance, so I didn't say it.” Teacher Yao placed the letter in Shen Changan’s hand. “This letter had been lying in my mailbox for a long time. It wasn't until I replaced the mailbox three years ago that I discovered there were two letters inside."
Over the years, the journals and magazines he subscribed to were all delivered to the security guard’s room. The mailbox was never used, so he had never imagined that a girl, before her death, would have placed these two letters inside.