The warm afternoon sun shines through the window of Class 2-3 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.

Opening his eyes, he sees his childhood friend Han Do-hee sitting in a chair pulled right up to his desk. As if she had been watching him until he woke up, she flinches slightly and quickly pulls her hand away the moment their eyes meet.