Chapter 21 opens with a flashback to the beginning of the previous chapter, where the narrator tells us that he has come back from the dead and is now the head of the academy. He asks his senior sister why he is here, and she tells him that after he tried to kill himself, he used to pretend to be a fairy when his mind was unstable. She says that if he hadn't been found early, he would have been dead. She tells him to take more rest, and he agrees. He tells her that he's jealous that she only cares about her little junior brother. He says that his inner demon has not been eliminated, and if he returns to the fairy realm, his consciousness will be confused, and his 100 years of Taoist philosophy will be destroyed. Senior brother says that the only way to eliminate the inner demon is to kill the little fairy named Qiuluo. Senior Brother says that he considers his younger brother as his brother, and that he came back to the academy to get rid of the flow of time, space, and time again, and return to the realm of yang ming. The narrator asks if the library is in ruins, and the narrator says that it is. He wants to get out quickly, because if he is caught, he'll be exposed as the fake identity of a girl. He also wants to clean up all the ancient books in the library, because he doesn't want his fake identity to be exposed. He's worried that if someone finds him, he won't be able to get away. He thinks that if