It was a real-life incident in a school in which Yang taught-the beating to death of a student by a group of youths-that gave him the idea of exploring the world of young people. One of the youths accused in the killing was a friend of the movie's leading male, Tsai Hsin-hung.
這個真實故事就發生在楊順清任教的校園中，一位學生被其他少年圍毆致死，讓他興起想探討青少年世界的念頭，片中男主角蔡信弘的朋友就是牽涉這件少年殺人事件的嫌犯之一。