MTL - Underworld Game Producer - Chapter 209 A misunderstanding caused a 'bloody case'!

Alix, a devoted player of Strongest Kingdom, finds himself reincarnated as his in-game avatar—the powerful and fearsome Demon King—in a mysterious and unfamiliar world. Armed with his gaming prowess and a penchant for stirring up trouble, Alix must navigate a realm fraught with danger, intrigue, and opportunity.As he discovers the secrets of his new domain, forms alliances, and faces relentless foes, one thing becomes clear: chaos follows wherever he goes. Will Alix rise to become the ultimate ruler, or will his wild antics lead to his kingdom's downfall?Join him in this thrilling, action-packed adventure where strategy, humor, and epic battles collide!

This is the story of a modern sailor who was accidentally reborn as a soldier of the Brazilian Expeditionary Force, and finally became the largest plutocratic family in Brazil by virtue of his foresight.

- Description from novelbuddy

This story is centered around the man named Yi Ji-Hyuk, who has spent 1000 years in a Medieval Western fantasy-like world before returning back to the modern-day Earth. When he returns, he finds that his home is facing monster threats, and that humans with superpowers have appeared to protect the innocent people of Earth.