The series revolves around the thoracic surgery department of a hospital. Park Tae Soo is a thoracic surgery fellow for four years whose mother is waiting for a heart transplant. Meanwhile, Choi Suk Han is a thoracic surgeon who is renowned for his skills but has not been treated fairly due to his humble medical background from a local university. A mysterious woman, who had a near death experience, decides to become a resident of thoracic surgery. (Source: KoreanDrama.org)