Yoon-soo starts to smile little by little thanks to Seung-yoo, and the two of them have an enjoyable and memorable time together. Meanwhile, Noh Jung-ah, who is furious at Yoon-soo for targeting her, decides to get in the way of Si-an, the one student Yoon-soo cherishes. Yoon-soo notices the provocation and resolves to face her.