Kim Jiwon, better known as Bobby, is a childish year three high school student.

He picks on Park Soeul, a girl who knows not to back down from a challenge.

Bobby throws paper airplanes, with insults written on them, at Soeul.

Soeul is annoyed by Bobby's attitude, but she can't figure out why he pesters her with paper planes.

She can't figure out that Bobby has liked her for all of those years and forever will.