On the draft paper of the seventeen-year-old, in addition to the function questions, there is also an unspoken love hidden in it. He said she should study hard first, so she folded her heartbeat into a paper airplane and quietly landed on the corner of his desk.
On graduation day, in the noisy crowd, she stood on tiptoe and said in his ear: "I am eighteen this year and will wait for you to be twenty-eight. If we are both single by then, let's get married."
He didn't nod or shake his head, he just said "hmm".
Later, everyone went to distant places, and the scent of soap locust on the school uniforms faded away, but the promise that spanned ten years was still hanging gently in time like the summer wind.
Concept: The regret of being fond of in high school