41 parts Ongoing In South Korea's top hospital, Hyeri, the emotionally distant cardiothoracic surgeon, is known for her flawless technique but avoids personal connections. Soobin, a kind-hearted anesthesiologist with a past of living in her older sister's shadow, is eager to prove herself despite her quiet demeanor. When the two are forced to work together on a high-stakes surgery, they begin to form an unexpected bond, though Hyeri's walls remain unyielding. As their professional and personal lives intertwine, they confront the trauma and insecurities that keep them from fully opening up to each other.