Let's Go To The Gym !

Summary

Woo-hyung, who had a complex about his skinny body without muscle, heard that a men-only gym had opened in his neighborhood and visited to try it out for a day, but he ended up signing up for a membership without thinking. After Woo-hyung finishes working out alone, stimulating his front and back, he asks his trainer to check his ass**** to see if he has been working out properly.