Hyeonseong Hospital is the best national hospital with the most advanced medical techniques. Although it is obvious that it is the safest place to be in the country, something mysterious is happening inside the hospital. What is the truth? Who is the criminal? Lee Yeongo is an elite neurosurgeon. He may win recognition from the patients but when he is alone, he feels empty deep in the mind. There is no compassion or emotion for him. Could we think of him as good?