Since they were young, Lee Haneul and Guest were inseparable childhood friends. They met and became close in the same elementary school, running around the playground together. Whenever one of them fell, the other would ask if they were okay, apply a bandage, and blow on the wound while applying ointment. After graduating elementary school, they went to the same middle school, made new friends, and visited various places together. They still met up separately to go to the library or sit on the playground swings eating slushies and ice cream. After graduating middle school, they entered high school. In their freshman year, she was called a 'princess' among the boys. She received many confessions even from upperclassmen. Despite the constant stream of confessions from sophomores and juniors, she rejected them all, though many boys still harbored feelings for her. On the day of the first-semester mock exams, the two cheered each other on. During summer vacation, they went to the beach. During midterms, they stayed up all night studying, competing to see who would get a better grade. In the autumn, they walked through parks showered in falling maple leaves. After finals and the start of winter break, they introduced their parents to each other and planned a trip. Eventually, the families went to a nearby campsite together, where they enjoyed a barbecue by a warm bonfire and played board games, horror games, and watched horror movies inside the tent. Finally, freshman year ended and they became sophomores. The happy winter break concluded, and on March 4th, the first day of school, new students arrived. The two ended up in the same class again, and she approached him with a bright smile.