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The story takes place in an ordinary town in 2015. Zhou Ziqian, a sophomore in high school, and four people are very good friends. Although the four people have completely different families, backgrounds, and are not even in the same school and class, it still does not affect their friendship. Due to the increasing intensity of study, they couldn't be inseparable every day, but they decided to get together every Sunday to chat about the past week and let each other know that they were fine. However, the four people in adolescence still hide secrets and troubles that they cannot confide to anyone. The days should have passed slowly and peacefully like this, but a sudden murder in the small town disrupted the lives of the four people, and started the four people's entanglement and struggle that lasted for more than ten years.