The school Jongdae works at gets a new teacher. Physics and Algebra teacher Dr Oh Sehun who previously taught at a university. And with each little snippet they experience throughout the day, it's not getting easier. And students can't stop themselves from shipping the two when they throw bad pickup lines at each other. Problems also ensue.

Lee Jinki, a young, rich, and awkward investment banker, becomes Kibum’s sugar daddy and all Kibum has to do is pretend to be Jinki’s boyfriend in return. Sounds simple enough, right?

Baekhyun has a strange addiction with pick-up lines but Jongdae thinks it's endearing.