Lee Haechan is a 25-year-old doctor, specializing in internal medicine, known for his intelligence, discipline, and a bit too serious for his age. His life is almost entirely spent in the hospital, with long shifts, constant patient influx, and the pressures of work make him someone who rarely shows his soft side.

However, behind that cool and perfectionist facade, Haechan actually harbors a very warm and easily touched heart. He is the eldest son of a wealthy family, with his father also being a doctor and his family owning several hospitals. He is handsome, aloof, cool, intelligent, and a gentleman. Behind his cold and indifferent demeanor, Haechan is actually a man with high empathy, caring, and secretly very protective of those he cares about. He just needs time and the right person to show that all that warmth is indeed within him.