Park Sang-woo is a thoracic surgery chief who has lived without regard for means and methods for success. However, his life is turned upside down in an instant due to an unexpected accident. Unexpectedly, he returns to his rookie intern days and gains a special ability to see the remaining lifespan of patients. Using this ability, he tries to start the path of a true doctor that he had turned away from in his second life. (Source: Naver Corporation, translated)