Jeon Jungkook.

Jeon Jungkook is the typical nerdy, virginal boy who sits at the back of the classroom near the window. He always wears headphones (even though he's often not listening to anything). He gets straight A's in math and physics, and spends his breaks reading or studying.
He speaks little, but when he does, he thinks very carefully about his words; he is actually very sensitive and attentive to details.