Im Hayun, known as an advertising genius, suddenly finds herself dropped into the Joseon Dynasty by the power of a mysterious artifact. To return to the modern era, she must find that artifact again! After many twists and turns, Hayun enters a merchant guild and begins a soaring success with her unique talent... "The only person I acknowledge is you." Her once-dismissive rival soon pledges loyalty, "Use your abilities for me." And King Heonjong, who recognized her talent, gradually starts showing interest too? Advertising genius Im Hayun, redesign Joseon anew!