[Fei Shuang Wen x Exploring the Puzzles of Human Nature] An old man swinging at midnight, a real chainsaw murderer, and residual limbs hanging on trees. We have solved one bizarre case after another, just to find the cult organization "Zero" who instigates human crimes. The old case ends and a new one begins. Are their crimes really unpardonable? What kind of secrets are hidden behind each case, and what kind of monologues exist deep in the sin.
