This novel tells the story of what happened at Children's Mercy Hospital in Lahu Autonomous County, Lancang County. Three-year-old Li Zhaer was brought to this Children's Mercy Hospital by her mother because she had been coughing and having fever for many days. The pediatric outpatient clinic was overcrowded. After waiting anxiously, Li Zhaer met the doctor in charge of Mrs. Li. The doctor cordially inquired about the condition in Lancang dialect, and then conducted a careful physical examination, including a series of professional operations such as touching the forehead to take the temperature, using a stethoscope to listen to the rales in the lungs, checking the throat, touching the lymph nodes, and pressing the abdomen. The examination results showed that Li Zhaer suffered from bronchopneumonia and needed hospitalization. This story revolves around Li Zhaer's treatment, showing the worries he and his family have when facing their child's illness. It also reflects the professionalism and love of the team of deputy chief physician Li Fangcao and nurse Tie Baobao. It tells in-depth about Li Zhaer's various experiences during the treatment process, including the tense moments when the condition changes, the unremitting efforts of medical staff to fight against the disease, and the warm scenes of family accompanying the child to overcome the disease, allowing readers to understand pneumonia-related knowledge and the treatment process.