Bong Dal-Hee, a first-year thoracic surgery resident, finally gets the opportunity of a lifetime to work at one of Seoul’s most prestigious hospitals. However, her dream quickly becomes a nightmare as she finds herself an underdog in a world of elite colleagues. Coming from a small town and attending a lesser-known medical school, Dal-Hee struggles with insecurities and her history of health issues as she tries to prove herself in the competitive world of surgery. Thrown into the demanding care of Ahn Joong-Geun, a cold and perfectionistic cardiothoracic surgeon, Dal-hee is pushed to her limits. Despite the grueling pressure, she finds an unexpected ally in Lee Geon-Wook, a kind-hearted pediatric surgeon who harbors his own secrets. As Dal-Hee faces intense surgeries, rivalries, and her growing emotional challenges, she learns that becoming a great doctor is about more than just skill. Embracing vulnerability, trusting others, and confronting her own inner battles, she begins to grow into the skilled surgeon she always aspired to be.