The Mystery of the Purple Fog. A Lonely Flame

Lin – the assistant of a young psychotherapist Cheng Yu. Once in the past, she was his patient, and after healing, she became fascinated with psychology. Together, they successfully help students at Nanshan School, until one day Cheng Yu gets drawn into a dangerous bet. A schoolgirl named Rina, who suffers from insomnia, is sent to him. At first glance, the case seems simple, but with each session, Lin notices that it is not Rina who is changing, but Cheng Yu himself!
Lin must save her mentor, but will the student be able to succeed where the master has failed? What secrets does Rina keep, and why did she really appear at the doorstep of Cheng Yu's office?