At the moment of death, the old woman Liu Li traveled back to her high school class, where she was lost and took the wrong path in life, to save the love that could not be realized in this life, the lives of her friends, regrets, and to realize her ideals, meet her old friends again, and spend her youth.
If we can regret in life, how should we spend our youth in the past, and whether we can stop being a mediocre ordinary person all our lives.
Can the love that I had to miss because of my real personality be come back again?
Use an adult's mind to face the problems of adolescence and face the dark side of adolescence that adults can't imagine.
Discuss the unfairness of education and how we, who have grown up under elitist thinking, should find a sense of happiness.