"The four (maybe) normal students of Kangwon University

Jisung Park is 20 years old, he goes to university and he is so bad at maths that he does not even know his times tables. He lives in a flat near the campus with his three childhood friends: Choi,Jeong and Minji,who aren't doing much better...though at least they know their multiplication tables.Then there's professor Lee Seong-min :23 years old, a math professor,and every girl in the university his in love with him,even though he has two daughters and a girlfriend. Between classes,disasters and bad decisions,Jisung's life is going to be even more chaotic than his thoughts . What will happen between him and his professor?