After a Thousand Years of Sign-Ins, the Demon Emperor Dies Suddenly from the Start

Su Bai is an undercover agent planted in the Demon Realm by the Immortal Realm. He has always kept a low profile, plotting behind the scenes and helping the Demon Emperor unify the Demon Realm.

To his utter surprise, after he had been doing sign-ins in the Demon Realm for a thousand years, the Demon Emperor was gravely wounded in a secret realm and had little time left to live.

Suddenly, the Demon Realm was left without a leader.

The Immortal Realm immediately ordered interference in the Demon Realm and secretly began its plan to destroy it.

But the Immortal Realm had always treated Su Bai as a pawn, even assigning others to watch his every move. After the Demon Emperor's persuasion, Su Bai angrily decided to deal with his former handler, eliminate his rivals one by one, rule the Demon Realm himself, become the new Demon Emperor, and build a new world.

The blurb doesn't do it justice, so read the story. Ruthless and decisive, invincible from the start.

Also known as: I'm the Immortal Realm's Top Undercover Agent; From Undercover in the Immortal Realm to Big Boss of the Demon Realm; The Key Measure of an Undercover Agent's Success

This novel and its characters are entirely fictional. Any resemblance to actual people or events is purely coincidental. Do not imitate.