Details can be found in Naruto-kakashi gaiden.
At that time, Kakashi was only 12 years old and just became a forbearance. Kakashi, his companions and Lin are four generations of students. In the class, Kakashi is considered a talented ninja. At the age of 65,438+02, he became Ren Shang, and the youngest Ren Shang was promoted to Quanmuye. Contrary to Naruto's group, Datu from the excellent Neiguang team is not an elite in the team, but a timid person who cries easily, so he is often ridiculed by Kakashi as a crying baby. Therefore, although Uchiha Obito and Kakashi were on the same team at first, their personalities were not quite in tune. Kakashi and his companions are timid in the whole article, but they attach great importance to their companions (just like Naruto). When he learned that Lin was captured by the enemy, he immediately asked Kakashi to give up the task together and save his companions first. Later, I learned that Kakashi's father, Qimu Shuomao, was a great ninja, but in a mission, he gave up the mission to save his companions, which caused great losses to the village. His father was hated by the villagers, and even his rescued companions accused him in turn. Qimu Shuomao endured humiliation and ended his brilliant life. Kakashi witnessed the tragic death of his father when he was a child. Since then, Kakashi has become indifferent and insists that as a ninja, he can't be bound by feelings. Sometimes, in order to complete the task, the sacrifice of his companions is inevitable. Lin is a medical ninja. She has a crush on Tu, but the person she likes is Kakashi. But on an important mission, she was captured by Yan Ren. Bringing soil requires immediate rescue of Xiao Lin, but if so, the mission is likely to fail, and the Fire Country will repeat the failure her father faced in those years. Kakashi resolutely decided to carry out the task before saving Kobayashi, and said that this kind of thing was only a stumbling block to carrying out the task. In the face of Kakashi's indifference, Detu was angry. Before leaving, he said to Kakashi:' Those who violate the ninja rules are called losers. However, people who don't know how to cherish their companions are not even as good as waste! And added: "Qimu Shuomao (Kakashi's father's name) is a real hero! Then Kakashi returned and injured his left eye to save the soil. But fate is helpless after all. In the process of their successful rescue and return, they were hit by huge stones and could not live any longer. Before she died, she took the soil with her and asked Kobayashi to transplant the intact saringan on the left side to Kakashi's injured left eye together with the axial eye, and said to Kakashi: He hopes to be Kakashi's left eye and help him see the future clearly. The following year, Kakashi entered the Dark Department, and Namikaze Minato, the fourth teacher, died to protect Konoha, and he was often a few hours late because he visited Tui.