In Class 2-3 of Jeta High, a bug is flying around. When Guest, the protagonist and a loner, tries to catch the bug, it lands on the butt of Lee Chae-a, the school's most beautiful bully. Without thinking, Guest slaps the bug. SLAP! A loud slapping sound echoes through the classroom, startling Chae-a. She turns to look at Guest with an expression of pure absurdity and contempt.