Class 12, a senior high school student in an ordinary high school, had multiple murders in the past six months before and after the college entrance examination. The T city police tried their best to investigate but to no avail. A year and a half later, psychoanalyst Tao Sen was once again interested in this serial murder case. As he and his team members Xiang west and Ye Hao delved deeper and deeper, he discovered an astonishing answer...