Bo Ling has been secretly in love with He Xiao for 3 years. She thought she was the only one who knew about it, but in fact He Xiao also liked her. They later went to the same high school. He Xiao wanted to go abroad to go to university, so Bo Ling waited for him.
"A late letter, the girl will stay for five years."
After receiving the letter, He Xiao was no longer there.
Purpose: cherish the present moment