Relying on an Ancient Medical Book, I Became an Unlicensed Miracle Doctor

Before the little senior sister disappeared, she gave him an ancient medical book: "Protect with your life." After many years, his hometown Shantou was about to be acquired. He took the book and 3,000 yuan and broke into Jincheng alone. Looking for my senior sister and protecting my hometown, I have to use both hands. I originally wanted to use my medical skills to sneak into the acquirer's company, but I never expected—— His extensive medical skills are not worth mentioning in a big city but these three words: "Do you have proof?" So... How to break this deadlock?