Back in the day, the immortals appointed by their father kept the returning night scroll and the fair night scroll, respectively. In order to protect yue, father entrusted him to the immortal named qing yu. However, he was not expecting that he would bewitched and go mad, and so he was killed by the immortal realm. The immortal realm also killed our family back then, so we all have an opportunity to become the host of the night. The narrator explains that the night that guided him and helped him get his revenge was the night of the return, and the narrator is certain that he will be able to get revenge on that night if he is able to destroy the night's control over him and his sister.