When the daughter of Chebol Lee, the richest man in the country disappears and a never seen ancient painting is found in the Gyeonbokgung, historian Cheon Hyejeong is asked to solve the mystery. With legends coming to life, shadows and monsters hunting for her from nightfall till dawn, she not only has to find the missing girl, but also face the man she hasn’t seen since university days. Armed in highest technology, annoyingly cooky and deadly handsome Drone Master Dongwoo is the only person powerful enough to help her, but her unanswered feelings and his dark past make them the most unfitting partners, still when battles become longer, bonds are tested and new enemies appear, this alliance might either break them or be the only reason to survive till another sunrise.