Lee Ik-jun is an assistant professor of general surgery specializing in liver transplants and a single father to his only son Woo-joo after getting divorced from his absent wife. His cheerful charisma allows him to connect with both patients and doctors, making him a popular figure in the hospital.the most humorous dramatic

A devout Catholic, Ahn Jeong-won is the son of the founder of the hospital and an assistant professor of pediatric surgery,also known as Andrea his catholic name cherished by his patients for his caring and sensible personality. However, seeing his patients suffer causes him distress, so he is secretly planning to become a priest against the wishes of his mother, Jung Ro-sa (Kim Hae-sook).

Kim Jun-wan is an associate professor and later head of the cardiothoracic surgery department at Yulje, admired and feared by his subordinates due to his exceptional surgical skills and his cold demeanor. He has known Ik-jun and his family, including his lively sister Ik-sun , since childhood.

Yang Seok-hyeong is an assistant professor of obstetrics and gynaecology perceived as aloof and sometimes detached due to his introverted personality, but he is in reality attentive and understanding toward his patients. He is divorced and has a complicated family history, but deeply cares about his mother.

The only woman in the group of friends, Chae Song-hwa, is an associate professor of neurosurgery, considered as the perfect doctor by her colleagues and patients alike thanks to her brilliant career, accommodating disposition and bright personality.

They 5 have band known as Mido fasso song hwa sings like a dying crow but she never realizes it ik Jun sings and dances nice know how to play the jazz guitar Jun also singing ans jazz guitar song hwa jazz guitar jeon wan drums as well as singi g yang seok hyeong the majer of the band pianist sometimes a singer