After finally passing his teacher’s exam on the third attempt, a young man quickly learns that passing an exam does not make him a teacher. He struggles to get through to his students, until on a field trip to the river, he makes an unconscious remark about fireflies, and suddenly all his students are paying attention. So he creates a class project to clean up the river and raise fireflies to fly over it once again. The students become passionately involved in their firefly project, but it brings their teacher into conflict with their parents, the school administration and even the city itself. Quietly he is told he can save his job by stopping the project, but he knows he cannot give up on the children. Believing in them is what teaching is all about…