The life of the protagonist Qin Qing is told from a third perspective, especially related to Lu Yan.
For Qin Qing, Lu Yan was a beam of light in her dark time, bringing a lot of warmth. But later, Qin Qing thought that her and Lu Yan's values were really different, so she chose a childish way to end her relationship with Lu Yan and went to a strange city alone...
As an adult, Qin Qing looked back on this relationship and thought that he was really too naive at the time and wanted to make up for it, but it was too late...
Purpose: Remembering the lost youth