The first book in the monster series.
Shang Si, a big monster with a vicious mouth and a soft heart, is the patriarch of the monsters. He is known as the Fourth Master in the world. He has been running a monster study for thousands of years, educating the monster world about illiteracy, and guarding the east of the city.
Lu Zhifei, a human, was raised by a human father and a ginkgo tree demon. He could see the tree spirit when he was young. When he grew up, in order to see his father again, he came to the monster study by chance.
The most impressive part is when the mountains and rivers were in turmoil, humans, monsters, monster hunters, and half-demon fought for the sake of their country and their country without fear of life or death.