Medicine for Hundreds of Years

Bai Shanshan is a medical student. After 4 years of study, he entered the clinical medical internship stage. During the internship, he met a highly respected female professor. The female professor was very strict with everyone, but she was kind to him. He also became the female professor's student. Time is not forgiving, and the female professor finally passed away due to old age. When Bai Shanshan was cleaning up the professor's office, he found a diary, which contained photos of the professor when he was young. He also traveled back to sixty years ago...