Welcome to Seoul Heath and Sciences Univerisity, the number one teaching hospital in the country. 

There's Nam Woohyun, the prodigy neurosurgeon who is the youngest chief of surgery in the world. Because of his young age and such high status, many look up to him and resepct him. Yet with the new class of interns and fellows coming in, a new neurosurgical fellow named Kim Sunggyu who refuses to take orders from someone younger than him makes things difficult of Woohyun. 

A story that mainly focuses on WooGyu, but also trails into other relationships as the staff tries balancing saving lives while also dealing with their own personal lives.