Chen He was born into a medical family and is a skilled surgeon with a 100% success rate in surgery. His girlfriend is also a doctor. Chen He accidentally traveled back to the Joseon Dynasty 150 years ago and met Heungseon Daewongun, a future political celebrity, Kim Gyeong-tak, the highest warrior, and Hong Young-rae, who looks almost exactly like his modern girlfriend... His superb medical skills changed the fate of the ancients and involved himself in the waves of history, and Chen He also realized his own life in it...