When Princess Nogoog (Se-Young Park), the queen-to-be of the medieval kingdom of Goryeo (Korea)is seriously wounded by assassins, the king (Deok-Hwan Ryu) sends Captain Choi Young (Min-Ho Lee) through a miniature wormhole to what he thinks is heaven, but is actually 21st-century South Korea, to bring back "God's Doctor" of ancient legend. Instead he brings back a reluctant plastic surgeon and spoiled brat, Dr. Yoo Eun-Soo (Hee-Seon Kim). She saves the princess' life and becomes known as Eui Seon, the great doctor from heaven. Unfortunately, while this position is privileged, it is also dangerous as no fewer than three politicians, the king and his uncle (Yoon-Jae Park) and a nobleman (Oh-Seong Yu), fight over her custody. But she grows increasingly attached to Choi who dedicates himself to protecting her by playing the politicians against each other; although, he tries to favor the king as long as the latter's interests do not conflict with Yoo's. He is aided by a large cast of warriors and members of the underworld and is opposed by the henchmen of the nobleman, some of whom have superpowers.