In an unexpected encounter when they were young, Bai Xiaoxiao's uncle rescued Ling Yihui who had fallen into the water. The daily conversations between the two children became a lingering thought in Ling Yihui's mind in the days to come. He regarded the uncle who saved him as a great hero in his heart, and was lucky enough to get the coveted badge, which he carried around like a treasure. But when I transferred to the city I had visited before, I met the person I liked. The obsession in my heart always felt that this girl was the little girl wearing the butterfly hairpin. Time and time again, he discovered that she was not her. His parents and Bai Xiaoxiao's parents were both university alumni. After graduation, they did not keep in touch with each other very often, but because of the meeting of the two children, the two families started to move around again. Ling Yihui's parents had a huge disparity in family status. His mother was bullied by her mother-in-law, so she strongly objected when she learned that her son liked Bai Xiaoxiao. Installing surveillance cameras and peeking into diaries, she tried every means possible to prevent her son from following her own path. Ling Yihui felt like he was going crazy. His mother's control and various arrangements made this adolescent boy extremely rebellious. The mother's excessive interference caused her son to suffer from gastroenteritis due to food poisoning. Since then, the mother's desire for control has been restrained. At this time, Bai Xiaoxiao took a liking to the boy and helped him through the most difficult days regardless of past grudges. She helped him with his homework in the shortest possible time, and he was successfully admitted to the school she chose. Youth is both bitter and sweet. It carries the mark of their growth and their regretless choices.