Kim Ho is on the prowl. He may look like a human, but he is far from it. He is actually part of a species of foxes that once owned large swaths of territory that humans have since taken over. To survive, the foxes have integrated into human society in the areas they once ruled and go on the hunt for mates in clubs. Ho is doing his duty for his species by mating with someone in the club bathroom, but a wolf breaks down the stall door just before he can complete his mission.
As it turns out, wolves also used to own territory in this area and had to fight for the same territory as the foxes. The alpha wolf Han Sirang happens to be the one to come upon Ho in the throes of passion. As soon as he figures out what Ho is doing, Sirang, to gain the upper hand, takes a photo of Ho mid-coitus and threatens him with the image. Unable to do anything else, Ho goes along with Sirang's demands, primarily sexual in nature, all the while trying to figure out how to get rid of the image so he can be free of Sirang's influence.
But what started as a game for Sirang appears to be becoming something more.