I’m Just a Constable, and You Want Me to Slay Demons?

[Transmigration + no System + no clichés + hot-blooded + immortal cultivation]

Also known as "From Black-Robed Constable to Supreme Immortal Emperor", "Ten Years Slaying Demons, One Sword Opens Heaven’s Gate", and "At the Demon-Slaying Bureau, the Stunning Demoness Begs Me to Let Her Go"

“Grandpa, I heard there used to be lots of monsters and demons in the world?”

“That’s right. Back then, the people of our world had a hard life. They were often turned into food for monsters and demons.”

“Then why aren’t there any now?”

“Because a single constable wiped them all out!”