After the Math Olympics, Seung-yoo opens up and tells Yoon-soo the traumatic experience he had bottled up inside of him for a long time. Yoon-soo comforts him and sympathizes with Seung-yoo’s pain. However, Sung-jae witnesses the moment and gets overwhelmed with a strange feeling. Meanwhile, suspicions that Ye-rin got preferential consideration for the competition to become an issue.