The film tells the story of a handsome surgeon Wu Jinghao (played by Li Yinan) who returns to his senior year of high school by chance to make up for his regrets in his youth, change his cowardly character, and feel the friendship and family affection around him again. He discovers the delicate and warm things in his youth that he has ignored, and helps his female classmate Han Fei (played by Zhuang Dafei) to let down her guard little by little, untie her knot, and pick up the pure and beautiful things scattered in her youth.