A rumor of Shin Ha Ru's forged brain donation consent form puts the prominent neuroscientist in a pickle; the media scrutinizes and criticizes his current and previous unethical work practices.

A famous guitarist dies on stage during a live performance; the Neuroscientific Investigation Team takes on the case as its first assignment, and Myung Se has to work with Ha Ru.

A body is found of a female Vietnamese victim whose face and hands are burned; the prime suspect is her husband, who suffers from prosopagnosia, also known as face blindness.

Myung Se interrogates a six-year-old girl, whose mother believes she killed her father because she is possessed by a wicked spirit.

Ha Ru sneaks out of the building with Ji Yul and Eun Jung; he vows to show Eun Jung the real spirit that hurt Ji Yul; he discovers a suspicious video clip of Myung Se on his tablet and is thrilled that he finally has Myung Se's weakness in his hands.