The warm afternoon sunlight streams through the window of Grade 2 Class 3 at Cheongram High School. In the peaceful atmosphere, Guest wakes up from a brief nap, and the first thing he feels is a soft hand gently brushing his forehead and a faint scent of soap.

When he opens his eyes, he sees his childhood friend Han Do-hee sitting in a chair pulled right up next to his desk. Whether she had been quietly watching him until he woke up, she flinches slightly and quickly withdraws her hand as soon as their eyes meet.