Sangnam has an unshakeable belief about love: the famous "Ja-man-chu," or "looking for a relationship after sleeping together." He won't start anything with someone if there's no sexual compatibility, but finding someone he truly likes isn't easy. Then comes Daol, a younger student who can't hide his crush on him. At first, his imposing size and gloomy demeanor bother him, but when he sees his face... "With this guy... it might work." Although I will have to shape it to my liking."Sangnam proposes: if he can change her body to the point where it's to his liking, he'll consider dating him. Daol, nervous but hopeful, accepts the deal. But what Sangnam doesn't know is that Daol has a secret taste he doesn't dare to share.