Emergency department standardized residency doctor Lin Shu can accidentally see the illness prompt tags above patients' heads. Starting from the emergency department, relying on this unique insight, he successively exposes easily misdiagnosed cases such as occult fever, delayed splenic rupture, and ectopic appendicitis. During the diagnosis and treatment journey, he constantly unlocks clinical skills, and his medical skills steadily improve. After transferring to the general surgery department, he faces difficult and complicated diseases such as gallbladder cancer and lupoid vasculitis head-on, neutralizing crises time and time again through the combination of tag clues and solid medical skills. The story focuses on clinical diagnosis, treatment, and doctor growth, witnessing a young doctor persevering in his original medical intention amidst rules, risks, and choices.