Professor Guk-jong works 120 hours a week. He has worked 36 hours in a row consistently for 15 years in trauma surgery while occasionally taking short naps. As a result, his right shoulder broke while going to the scene of the Sewol Ferry disaster and his left knee broke after he jumped out of a helicopter. His left eye became almost blind after capillaries in his eyes ruptured while he was treating Captain Seok Hae-kyun. People around him tried to stop him, but he said he would rest after completing treatment. Even when surgery was over, he operated again and again when the patient came, and eventually almost went blind. He discovered this issue in a medical checkup in 2015.