Cha Yo-han (Ji Sung) is a doctor of anesthesiology. He is arrogant, but he is a genius at his work. Kang Si-young (Lee Se-young) is a resident of anesthesiology who works with Cha Yo-Han. She is smart, warm and listens carefully to her patients. People, with mysterious acute or chronic pain come to the hospital. There, Cha Yo-han and Kang Shi-young try to find the causes of their pain.
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