The play tells the story of 30-year-old programmer Lin Huai De, who travels back to high school to meet his former best friend, Ji Twenty. He gets to know and understand her again from an adult's perspective, making up for the many regrets he left in his youth. Through the interaction between Lin Huai De and his classmates, the story shows the true and sincere friendship between classmates who help each other and resist difficulties together. (Source: Chinese = Baidu || Translation = MyDramaList)