Chen Mo, twenty years old, sophomore in the computer science department. By chance, he opened a ragged book called "Classic of Mountains and Seas Records" in the library's ancient books room, his finger was scratched by a page edge, and a drop of blood fell on it. Then his rented apartment gained two roommates. Baize, male, white hair with golden pupils, a pale golden vertical mark between his brows, ancient divine beast, knowing all things. Hobby of lying on the sofa playing video games. Su Jiu, female, silver hair with amber eyes, nine tails, Qingqiu nine-tailed fox, likes eating pudding.