In the fake campus, Class 4 is the only reality and the only living person left. But which one of the people they saw in the past was not the only one? Yangmeng Middle School, where there were green leaves and scorching sun everywhere, left them behind. If you were given another chance, would you come back again or give up. Or do you want to forget it forever, or would you rather remember the suffering of the past and find the self that is suffering.
Concept: Various people from the past