Lin Wei counted all the steps on the third floor of the teaching building - 17 steps. Among them, the sun on the 9th level was the most oblique, the 13th level had the loudest echo, and the 17th level could always catch Lu Xingmian's shadow stretched by the setting sun when he was out of school.
She counted three years, from "He walked two steps faster today than yesterday" to "The cuffs of his school uniform were frayed," but she didn't have the courage to raise her head when he turned around.
Until one day when it rained heavily, he stood at the top of the stairs holding an umbrella, and his shadow spread across the steps she had counted countless times: "Classmate, have you finished counting? If you don't go, the rain will get worse."
It turns out that some shadows will come to you on their own after waiting for a long time.
Concept: In youth, the throbbing secret love hidden between the stairs and shadows