This is City B, a third-tier city located at the southern tip of mainland China. This is Middle School C, an inconspicuous middle school located in City B. This is Middle School C, where they are.
Who are they? They may be just one of the many students cultivated by C Middle School, and they may be just the past students mentioned by the teacher, but for them, C Middle School is too important, because they spent three years of their youth in C Middle School.
Youth is like flowers blooming, and in the past three years, they have bloomed the most beautiful flowers.