Kang Cheolho, the strongest man who was summoned to another world and defeated the Demon King after a fierce battle, finally returns to Earth after 30 years. But the world he once knew has changed—Earth is now in the era of monster raids. Exhausted from a lifetime of fighting, Kang Cheolho no longer wishes to pick up a weapon. Instead, he chooses to pursue his long-forgotten dream: opening a restaurant and living a quiet, peaceful life. This is the story of his encounters with the guests who visit his diner, and the unique tales they bring with them.