Melancholia

After the Math Olympics, Seung Yoo opens up and tells Yoon Su the traumatic experience he had bottled up inside of him for a long time. Yoon Su 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.