Gitae, who quit his job and has been lazing around the house, saw a poster for recruiting part-timers at a fitness center. With the fantasy of getting a nice body and to avoid his mother's nagging, he applied. And at the gym, he got to see the fantastic chest of the trainer, Soohyeon. At that brief moment which made Gitae's hear race, he almost got injured... but it was Soohyeon who got hurt after saving him. Afterwards, Soohyeon asks a favor from Gitae that he couldn't refuse since he was feeling apologetic...