Hengyu Spirit Essence

There is something in this world called spirits. They have existed in the world since life first appeared. Spirits and living things are like toothpaste and toothbrushes: independent, yet inseparable. Where there is a world, there is life; where there is life, there are spirits. Spirits live off the spiritual energy of living beings, but under normal circumstances, they get along peacefully with humans.

Wu Dongyuan, a teacher at a certain school and one of the main members of a mysterious organization, set the gears of fate in motion when he tried to save his students...