The Demon Slayer Who Blends into the City

(Urban, invincible protagonist, passionate, cultivation, cleaning up officialdom, wielding the sword for the nation, crushing the island nation, no System, no son-in-law trope, no mindless plot.)

Under Qin Shi Huang served a group of demon slayers known as the Exorcists.

Their duty was to hunt down monsters across the Nine Provinces, extract their blood essence, and use it to make an elixir of immortality for Qin Shi Huang.

But Qin Shi Huang never achieved immortality.

The lineage of Exorcists, however, lived on.