Top medical expert accidentally time-travels to 1978, becoming the rural barefoot doctor Li Xiangnan. He and educated youth Lin Chuqiao are merely a shield fake couple; as soon as the college entrance examination ends, the other party proposes a divorce. The Lin family puts forward Beian City household registration and a machinery plant hospital establishment as compensation. The time-traveling Li Xiangnan completely lets go of his infatuated obsession, joins the emergency department, and relies on advanced medical skills to see through quack misdiagnoses. Beian City Hospital's Lin Muyu and gentle colleague Ding Yuqiu successively appreciate and recognize him, and the Lin family's younger sister also changes her view of him. Looking at the now dazzling Li Xiangnan, Lin Chuqiao wavers regarding the divorce, while he, holding hard-core medical skills, steadily carves out a world of his own in the seventies.