I have a date with a zombie. Who is Mr. Tianyi in 3 Li? How did he become like that? How did that magical book burn? Why did it burn?

Mr. Tianyi, formerly known as Mr. He Youqiu, is a gifted scholar and Taoist priest of Uncle Qiu's younger brother Mao's family. However, he was expelled from the Mao family because his forbidden spell of returning the sun violated the circular order of the world. From then on, He Yiqiu was renamed Mr. Tianyi, and he has a book that makes the world marvel, and is known as iron plate psychic. Huang Jijing's poetry book, also known as gobbledygook, records everything in the world, knowing astronomy above and geography below, but in fact gobbledygook is fate, and fate has always wanted to destroy the world, hide it in gobbledygook, and take the opportunity to occupy what it wants, and it becomes like that.