The prefect "laughs when he sees people and cries when he sees people cry" because he is an owl, a kind of monster.
The prefect's cell is very busy and often contains some ignorant monsters, such as human-faced owls, wind-sounding trees and so on. They didn't know how to pay when they ate, they didn't know how to give way when they saw the prince, they always flew around in front of the people, and sometimes they even breathed fire in the vegetable market...
After being fished out of the cell, the relationship between the monsters was not very harmonious.
So the Queen Mother, who was dedicated to worshiping Buddha, came up with a good idea and sent a 19-year-old human boy to join the team of monsters to teach them... How to behave.
So, they lived together happily, and the world was peaceful and harmonious.
Above.
The above is pure nonsense. How can the real world be so silly and sweet?