A young man named Park Shi-On (
Joo Won) has savant syndrome and a developmental disability. His mental age is that of a 10-year-old, but he becomes a paediatric surgeon. Meanwhile, Kim Do-Han (
Joo Sang-Wook), who is the best paediatric surgeon, finds himself frequently in confrontation with Park Shi-On.
Years later, Shi-On travels to Seoul for the first time to receive training as a medical resident. As he arrives at the Seoul Station, a child is seriously injured by a piece of glass that falls from the ceiling. Shi-On has never practiced medicine before, but he is able to administer first aid from reading all those medical books. He then gets on the ambulance that takes the injured child and his mother to the hospital. Shi-On learns that the ambulance is going to Sungwon University Hospital, which is where he is supposed to receive resident training. He becomes relieved by the coincidence, because he is already late for his interview.
Meanwhile, Choi Woo-Seok, who is now the chief director at Sungwon University Hospital, attempts to convince the other directors to accept Shi-On for training. The group of directors are not happy about Shi-On. When Shi-On does not appear on time, they decide to turn him away for good. Shi-On, though, is right outside of the surgery room where the injured child is receiving surgery. In the emergency room, Do-Han (
Joo Sang-Wook) and his team perform the surgery. After Shi-On learns that the surgery is a success, he goes to the meeting room, but only Doctor Choi Woo-Seok is there.
Shi-On goes to an apartment complex for hospital doctors where he will stay. When he sits down alone in the apartment, the apartment door opens and a woman enters. She eventually crashes on the bed. The woman is Yoon-Seo (
Moon Chae-Won), a resident in pediatric surgery. She is completely drunk and entered the wrong apartment. Shi-On stands right next to the bed, watching Yoon-Seo sleep. And the Story goes on.
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