Ko Woonha lives in constant pursuit of stimulation, yet his dulled senses leave him unable to truly feel pain, let alone pleasure. That changes after a single night with Cha Gyuwon, the younger brother of his FWB, when Woonha is able to experience genuine desire for the first time in his life. The problem is, Gyuwon is everything Woonha claims to despise: younger, inexperienced, and sworn to remain chaste until marriage, he seems to cling to a naive fantasy of a first love that will last forever. Convinced he’s made the worst possible mistake, Woonha tries to brush it off as nothing more than a lapse in judgment…until the reality of his situation hits him harder than he though possible: Gyuwon might be the only one who can make him feel anything - both physically and emotionally.