Jin Hyuk is a highly capable doctor, born into a family of doctors. He is also self-assured, as he knows he is the only neurosurgeon capable of analysing and dealing with any situation in a short space of time. He always succeeds. For this reason, he cannot accept the shortcomings of others. Jin Hyuk is engaged to Yoo Mi Na. One day, Jin Hyuk finds himself transported back to the Joseon era. Having travelled 150 years back in time, he witnesses medical techniques in their infancy and learns what it means to be a true doctor. In the past, he is helped by Lee Ha Eung, a friendly older man, and meets Hong Young Rae, a lively and kind young woman from a fallen noble family, who is the spitting image of his fiancée. However, she is the future bride of Kim Kyung Tak, the serious chief of the Joseon police and the illegitimate son of an ambitious politician.