Criminal investigation captain Song Ke and psychological profiler Bai Yan, two partners with completely different styles who focus on evidence to solve cases and the other on traces and psychology, have a strange tacit understanding in one weird case after another.
When sin begins to ferment in the city, the demons in the abyss are whispering and bewitching. One after another, the demons bred by sin are wandering in the city. Who can catch the traces exposed in the abyss.
