The first scene introduces Cobarin, a high school student with a crush on her classmate Park Jimin. Despite being introverted, Bowen categorizes her peers into two groups - those with access to the popular chat app Tutu and those without. A teacher catches a student using her phone during class, discovers Tutu, and learns it's a coveted app within the school. Tutu is encrypted, allowing students to create private chat groups and rooms. Hyrim and her group discuss joining a new chat room, interrupted by Zhong requesting access.