С 1, с 2: Seok Jiwon is secretly thrilled that Yun Jiwon remembers him. He makes various attempts to get closer to her, such as reviving the intensive study class, participating in the Creative Club meetings, and inviting her to lunch, but she remains distant. Meanwhile, Gong Munsu, a new gym teacher and former national swimming team member joins the school. However, he appears to have a connection with Yun Jiwon. That evening, during a staff dinner, Yun Jiwon and Seok Jiwon start arguing about the so-called "crazy lilac" that blooms sporadically. The argument escalates into a bet over whether the flower will bloom this year, echoing a bet they made 18 years ago during their final exam.