The Dying Man

(The male lead isn't an idiot. He's a growing protagonist whose personality changes as the story unfolds.)

This is a cruel world.

Immortal essence, mystic bodies, souls, and soul bodies are all part of this world. (Mystic bodies are made up of countless strands of immortal essence, while soul bodies are mysterious beings that originally belonged to this world...)

Ordinary people are creatures inside a drum: they know nothing.

"I am a mystic body... and a soul body, too."