Seung-yoo participates in the math competition and is picked to represent Asung High along with Ye-rin. The result shocks everyone who thought Seung-yoo had no talent in math except for Ye-rin who knows that Seung-yoo is a math genius. Meanwhile, the parents of other students and Ms. Noh aren’t happy with how Yoon-soo runs her math class and club.