I Became the Final Boss in the Game World?

The Story

Andrian stumbles into a mysterious digital realm, instantly activating the Ruthless System. He pleads for mercy as a B-grade ghost kneels in tears inside a terrifying castle, begging him to spare the non-player characters. Even the system administrator begs for help, but Andrian only sighs. He claims he did not want this outcome, yet the enemies look too easy to defeat. He wonders why the game, supposedly set to ruthless mode, feels more like he has become the final boss himself.