It mainly tells the story of 18-year-old Zhang Xin who chatted with Kang Yang on a certain do by chance, and then began a series of subsequent events, which were mutual redemption and year-on-year upside.
18-Year-old Zhang Xin is a student at a vocational high school in a small county town
Kang Yang doesn't need to go into details. It's all in the text.
Purpose: redemption