S1, E5: Ro Woon has had a crush on Ba Tang for a long time, so he has been bothered by Yi Soo's presence ever since he came to Balhae High School. After witnessing Yi Soo and Ba Tang together, his jealousy gets worse. During PE class, Ro Woon plays basketball against Yi Soo with the determination to not lose. Yi Soo tries his utmost to not fail the upcoming midterm exams.