Happy System: A monster's mercy

> A monster reborn. A system that demands happiness. A cruel world that only respects strength.

MDHK wakes up inside a goblin’s body—lost, confused, and broken. His people are gone, hunted like animals. But as the last heir to the goblin elders, he must rise.

A strange system called “Happy System” appears before him. To grow stronger, he must make monsters… happy?

In a world ruled by humans, where monsters are nothing more than prey, one goblin leader will stand against fate.

“Make them happy? Fine. But first, make them pay.”

A dark isekai tale of revenge, monsters, and mercy begins.