"Doctor John" is a medical drama centered on pain management specialists. It offers a unique perspective, treating the doctors' quest for the source of their patients' enigmatic pain as an exhilarating pursuit, akin to a detective unraveling an unsolved mystery. Cha Yo Han, a prodigious anesthesiologist and the youngest professor at his medical institution, is known as "10 Seconds" due to his remarkable ability to diagnose patients within the first 10 seconds of their consultation. Kang Shi Young, a renowned anesthesiologist, consistently ranked at the top of her class in medical school. Her exceptional skills come from her composed, logical mother, while her compassion, attentive nature, and warm patient interactions are traits inherited from her father.