The story was written by the author when he was in high school. It took him the longest time and put the most energy into it. The story is a green story that takes place among several high school students. Perhaps that period was the most important and beautiful in life. The author returned to the rooftop and corridor of his high school teaching building countless times in his dreams. Maybe there are no gorgeous words and thrilling plot, but I just want to impress the destined people in a certain moment, and go back to the depths of memories together, and see myself looking back.