Summary
After being teased at a drinking party for having a thin body, Woo-hyung, a college student, goes to a men-only gym that has opened in his neighborhood on a whim.He merely came for a day to give it a try, but he unconsciously signed up for a membership. Woo-hyung asks his trainer to check his asshole to make sure he has been exercising correctly after he has finished working out by himself, stimulating his front and back.