Cha Yo-Han, a prodigious anesthesiologist and the youngest professor at his institution, is nicknamed “10 Seconds” for his uncanny ability to diagnose patients almost instantly. Brilliant but emotionally detached, he treats pain as a clinical puzzle, not a human experience. Everything changes when he’s paired with Kang Shi-Young, a warm and empathetic resident whose patient-first approach clashes with his cold logic. As they confront complex cases together, Shi-Young’s compassion begins to soften Yo-Han’s hardened perspective. In unraveling the mysteries of pain, he’s forced to face his own buried wounds and reconsider what it truly means to heal. And through it all, Shi-Young becomes the bridge connecting his intellect with his humanity.