My Deskmate's Secret Notebook

The Father Who Makes Paper, the Mother Who Buries the Corpse, the Father Who Drives Away Corpses, and the Mother Who Raises Gu

The Protagonist Is Invincible and Secludes from the World, and Is Born Because His Apprentice Was Wronged.

The protagonist is invincible and has been hiding from the world for trillions of years. His apprentices are all big guys from all walks of life.