Citizens fear a serial killer who wears a gas mask. Joo Sang-geun, a candidate for the mayor of Seoul, is blackmailed by the serial killer and a girl, asserting that she was raped by her father, wants to be killed by the serial killer, Bo-sik working at parking lot dreams of catching the serial killer and a US soldier, Patrick, is shocked when his girlfriend is murdered by the serial killer. Centering on the emergence of a serial killer, [Anti Gas Skin] follows the reaction of people who worry about the killer in political, religious and individual ways. As the substance of their anxiety is unknown, the fear spreads and society becomes chaotic and then the film reveals how the mask of power can allay this chaotic situation in a satiric fashion. (LEE Sang-yong)