Joseon's genius, Heo Gyun, gets entangled in a conspiracy while living in exile and is pursued by assassins. Just as he faces certain death, he finds himself in the heart of 21st-century Seoul.

Believing that 21st-century Seoul, where there is no class discrimination, is the authentic 'Yuldo-guk' of his dreams, Heo Gyun begins his chaotic adaptation at the grumpy Eunsil's small diner.

Heo Gyun saved Eun-sil's mother's life, but his identity is unknown and he is suspected by the police... Eun-sil, who can't cook, is in danger of having to close down her restaurant...