Go Eunha, who's been desperately seeking any kind of stimulation after becoming numb to it, finally experiences pleasure for the first time in his life with his partner's younger brother, Cha Gyuwon. <li> <li>However, he's younger than Go Eunha, something totally out of his usual type. On top of that, he's also a virgin who’d taken a vow of chastity. <li> <li><i>“So, you're gonna have sex without getting married?”</i></li> <li> <li><i>“Hey, you can't suck my ass like that and then act like I'm the only one at fault. ...Were you seriously thinking about marrying me?”</i> <li> <li><i>“Can we? We're both guys though…”</i> <li> <li> A younger virgin who's already thinking about marrying his first love. This is truly the worst. I messed up by getting involved with him. <li> <li><i>"It's okay, what happened between us doesn't count.”</i> <li> <li> But, differently from Go Eunha, Cha Gyuwon made a vow that would affect his entire life.