Normal People in Mental Hospital

This book tells the story of a normal person who mistakenly entered a mental hospital. He was judged to be a patient, but he kept insisting that he was a normal person. He was locked up in the hospital for three full months, and was locked up again after he came out. What is the truth, how should he escape, how to prove that he is a normal person, and finally turned into an "abnormal" person. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.