When the doomsday comes, the lunatic asylum becomes the last refuge of mankind and the most terrifying cemetery. Former sniper Shen Xiao and the silent experimental subject Su Ya are forced to form an alliance to fight against the predator Tie Qi, the mechanized Bones, and the spreading 'emotional infection'. When A Tao discovers that Su Ya's memory is the key, Lao Zhong's chalk line points to the end of the world not as a natural disaster but as an awakening - human emotions are the real host of the virus.
