General surgeon at Ishigaki Hospital.Cha Eun-jae's boyfriend.Born into a poor family, he worked part-time while studying to pay off his family's debts. After experiencing hardships and setbacks, he became a general surgeon and was known as a genius who was good at surgery.In the early years, Dr. Jiang Dongzhu, who had returned to China, was both a resident doctor in the main hospital.