The main character of this science fiction is a school teacher. He spends his days and nights thinking about various complex mathematical problems. Since then, various abnormalities have been observed in him. He always sees someone with him who claims to be an inhabitant of the world of zero. Since then, the author has created a huge web of illusion in the story. Does the young man from this zero world, whom Mr. Mansur calls Fibonacci after his favorite sequence, really exist in the real world, or is he just a figment of Mr. Mansur's imagination? This is the problem that Mr. Mansur's grandfather and father also tried to solve. That is, they have been working on this for three generations. But since Mr. Mansur has no heirs, he must solve this problem. Will he be able to solve this problem? An important feature of the book 'Shunno' is that the story is crafted very close to science.