Gu Yan. Originally a down-and-out scholar in the south of the Yangtze River, he was "specially recruited" by the Evil Suppression Department because he was involved in a bizarre "painted skin" case. He is not a "chosen son" in the traditional sense or has superior martial arts, but he possesses a rare "Qingming Lingtai" that even the Evil Suppression Division can hardly explain - he is extremely resistant to mental pollution, illusions, curses, etc., And can keenly sense the subtle fluctuations of "abnormalities". This makes him a "special tool" for dealing with some tricky things. He is a scholar with a strong desire to survive. He gradually grows up after being forced to get involved, struggling with fear and responsibility.