In 2018, Chinese-American Sun Nanshan returned to China for some purpose.
Participated in psychological counseling activities for prisoners in Yunhai No. 2 Prison,
An unexpected incident in which a prisoner kidnapped a counselor led to the acquaintance of psychologist Yang Yinfei.
A child kidnapping case led to the acquaintance of detective Lu Chaoyuan, and the detective Three Musketeers began to deconstruct major cases that seemed ordinary yet weird!
Concept: Multiple personality investigation
