Genius defection is the best doctor and hospital doctors working in South Korea caught in the drama group not to talk to strangers live.
As a child, Park Hoon (Lee Jong-suk) and his father Park Cheol (Kim Sang-joong) were tricked and sent to North Korea.
In North Korea, Park Hoon was trained to become a doctor by his father who was already a famous doctor.
Park Hoon became a genius thoracic surgeon.
He deeply fell in love with Song Jae-hee (Jin Se-yeon) in his high school.
Park Hoon's father then died and he tried to flee to South Korea with Jae-hee, but lost contact with her and at the end, he fled to South Korea alone, while looking for Jae-hee.
In South Korea, Park Hoon begins to work as doctor in a top hospital Myungwoo University Hospital.
Meanwhile, he found a girl that looks exactly like Jae-hee, Doctor Han Seung-hee, who claimed to not know Park Hoon.