Lee Dong-wook plays Yi Jin-woo, a specialist at the emergency medical center of Sangkook University Hospital, who is a doctor who pays attention to medical ethics. Cho Seung-woo plays Gu Seung-hyo, the general president of Sangkook University Hospital, who is a cold person who believes that data is above all else. Won Jin-ah plays Lee Wan-ha, the head of pediatrics. Yoo Jae-myung plays Zhou Jingwen, the director of the Sangkook University Thoracic Surgery Center. He has confidence in thoracic surgery and a sense of mission as a doctor. He is opposed to Gu Seung-hyo, the newly appointed general president of Sangkook University Hospital, on the operation of the hospital. Moon So-ri plays Wu Shihua, the director of the Sangkook University Neurosurgery Center, who is a golden key trained by her doctor parents. She is proud of her profession and ability and is full of ambition to become No. 1 in the industry. Lee Kyu-hyung plays Yi Jin-woo's (Lee Dong-wook) younger brother Yi Sun-woo, who is a plastic surgeon working at the Health Insurance Review Committee Evaluation Institute. His father died in a car accident when he was a child, and he has a leg disability. Cheon Ho-jin plays Lee Bo-hoon, the dean and psychiatrist of Sangkook University Hospital. The play is written by Li Xiuyan, who wrote "Secret Forest", and co-directed by "Well-Deserved Fame" and "Dear My Friends". It is a medical drama about power struggles and human desires in the hospital. It is expected to be broadcast on July 23.