Hunting fairies and demons

Introduction 1: In this world, there are immortals and demons.
Immortals plunder the heaven and earth, and demons bring disaster to the world. When immortals and demons appear, the world will be in chaos, and people will be in dire straits. The world calls it fairy disasters and demon disasters.
In the last years of the Chu Dynasty, the world was in chaos. The princes were fighting each other, and the clans were divided. Military disasters, demonic disasters, and fairy disasters came one after another. The world was like a purgatory.
This year, Lu Yan traveled through time and became the son of a first-class citizen. He awakened to the Book of Taoism, which gave hope to his already despairing heart, until he encountered a humanoid monster with two heads...
Introduction 2: Weird immortals and demons, unusual martial arts. This is a story about an ordinary person who traveled to another world and struggled to survive in a strange world with the help of a Taoist book.