Lü Changgen, a young man from a mountain village, studied under a renowned local physician and mastered exquisite medical skills as well as the art of observing qi. Faced with requests from villagers and disputes among neighbors, he stays true to his original aspiration, resolves conflicts skillfully with a benevolent heart and noble medical ethics, and safeguards the warmth of the village. When criminal gangs from the city use sorcery to bewitch university students, he steps forward bravely, exposes the conspiracy with wisdom and courage, and rescues the victimized girl. Guided by the extraordinary, he undertakes the mission of protecting the ecology of Mount Dayang and the well-being of the people. From an inexperienced apprentice to a guardian of justice, Lü Changgen writes an inspiring legend of a rural youth in the new era with responsibility and commitment, conveying positive and uplifting energy.