Flashback 7 years ago.
Chungak High School, 2-3 class.
The class was quite noisy with various activities in it. Except for one person who remained calm with his books, Kim Tae Hoon. He wasn't bothered at all by the noise that roared in his class.
"Hey!" A woman suddenly greeted him while handing him a notebook. Tae Hoon then looked up. He was quite confused by the presence of a woman he didn't recognize.
"Who are you?" he ask.
The woman then got annoyed because Tae Hoon didn't recognize her. She replied in an annoyed tone, "It's me! Han Soo-Ah, your classmate, you idiot!"
"But I never saw you."
"That's because I'm busy practicing volleyball for the summer tournament," Soo-Ah said very proudly while shaking her hair. "You should be rooting for me."
"Uh, really? So, what's up with you coming to me all of a sudden?"
"Math."
"Huh?"
