That night He Li received a call from Yang Feifei on the rooftop of the library.
"I can't hold it anymore... I really can't hold it anymore..."
More than a thousand kilometers away, she was crying. He Li held the mobile phone, and the wind blew the sound in the receiver.
They met in high school. The kind from the next class.
Yang Feifei called her when he was at his most devastated.
"... Do you think I'm particularly annoying?"
"It's not annoying."
It's a long story.
From the age of sixteen to many years later, there was always something separating them.
Across the wall, thousands of miles away, and the unspoken words.
Birds keep flying, and fences are repeatedly demolished and built.
Purpose: To commemorate the lost youth