Lu An is a medical graduate from an ordinary college. He has superb medical skills passed down from his ancestors, but he has been repeatedly rejected by major hospitals because of his academic qualifications. His future is dim after graduation. On the way to work on the bus this day, there was a sudden commotion in the carriage - an old lady had an acute myocardial infarction, her face was pale, her breathing was weak, and the passengers around her were panicking. Zhang Lei stepped forward at the critical moment and accurately completed the first aid operation with only the first aid items he carried, stabilizing the old lady's condition in just a few minutes. His professional techniques and calm posture not only attracted everyone's attention, but also quietly opened a counterattack hole in his life.