This is a story about true servants of the Hippocratic oath who are truly passionate about their work. The focus is on three doctors who work in the surgical department. Every day, they fight for the lives of their patients and professional recognition. The heroes face many challenges along the way. Chief doctor Park Tae Soo is in a state of impatient waiting. The reason is that his mother is in the hospital and needs urgent surgery. Now, the woman's life is in the hands of cardiothoracic surgeons.