The heroine Yin Qiutong, like many girls who have just entered college, longs for love, longs for friendship, likes to be lively, likes to be liked by others, and then faces the world with sincerity, regardless of happiness, anger, sorrow, and joy, she will not hide it. Even if it's a little bit negative, it's definitely kind. This is a true story. I use Yin Qiutong's perspective to explain the human nature in parallel time and space, the human nature of every little person, the human nature of a little girl, a little boy, or a bully in a primary school. They may be indifferent or awe-inspiring. They are just 20 years old. Some of them are not just sunshine, but also helplessness and regret. Some are not just black and white, love and hate, but also ambiguous sincerity, happiness and sadness. Fortunately, Yin Qiutong, like the author, has never changed, never changed her original intention, and they gradually believe that this is such a great thing.