Title of the novel

It was a novel about the growth of youth. The protagonist was a 13-year-old girl with depression. Because everyone saw that her grades were very difficult to get into high school, they said behind her back,"This child is finished." The protagonist was worried about his own future, but at the same time, because of everyone's discussion, he had no hope for the future and suffered from depression. At this time, a young geography teacher helped her to see through a lot, and her depression gradually recovered. Because the main character's singing was very good, he represented the entire school to sing a song by the Xidan girl,"Origin," during the graduation ceremony. Of course, this was not the original song. The main character requested to change it, and the school leaders felt that it could reflect the strong feelings between teachers and students, so they agreed. In fact, this was a song that the main character sang for the geography teacher. Because she had graduated in geography in the second year of junior high school, no one knew why she wanted to change it except her friends. Eight years later, at the middle school gathering, that friend made this point clear. "I give up the precepts of the gods and stand in front of you regardless of everything." It was true. The geography teacher was surrounded by hooligans on the roadside (because she was young, the hooligans didn't take it seriously). The protagonist happened to pass by and met the hooligans who wanted to harm the teacher, so he rushed in front of the teacher to block the knife. The hooligans saw that the teacher was injured and ran away. "As always, I'm accompanied by loneliness. What does the myriad of troubles have to do with me? At that moment, when you walked past me, I couldn't let go of the longing in my heart." It referred to the main character meeting this teacher when he was suffering from depression. "That day, we dyed our hair white and looked at the changes in the sea hand in hand. That day, when I looked at your aging face, I saw your unchanging face." The protagonist hinted that when she grew up, her teacher was no longer a girl in her 20s and had her own family. However, her impression of her teacher had never changed because of time. Moreover, because she had grown up, she could already "look at the changes of the sea hand in hand" with her teacher. "When I saw your sweet smile, I couldn't forget the moment I had you." The teacher's smile at that time gave the protagonist a ray of long-lost sunshine. After the protagonist separated from the teacher in the second year of junior high school, he could not forget the teacher. In addition, the protagonist became good friends with the teacher, and the protagonist almost developed a sisterly relationship with the teacher. There were many other words that had hints in the article. Here, I'll pick a few typical ones and ask for their names.