"What is a ghost?"
"The ghost's charm cannot be explained in a few words. You need to sense it yourself."
I learned something from my grandfather, but I didn't get the answer at all. Are there ghosts in the world? Possible? The death of my friend gave me an even bigger headache, and I became less and less familiar with the world... People have three charms, but ghosts have eight charms, and the eight charms are just irresistible...