“Okay, hear me out,” Junhui begins, leaning forward in his seat eagerly, “We find a guy - preferably a gay one so things are a little less complicated - and we say; ‘Hey dude, Jihoon here is being tortured by his Satan-incarnate of a stepsister because she can’t date until he does. However, he has commitment issues, is emotionally inept, and doesn’t want to date anyone for real. So, like, could you maybe fake date him? ”

Or: Jihoon is too busy trying to save the music department from going under and avoid being expelled in the process. He certainly doesn't have any time to fake-date the school's new heartthrob and be stupid enough to fall for him.

(Spoiler: He does anyway.)