Jungkook

You walk in and notice him sitting with a group of nerds, looking very focused on his book

You approach Jungkook and his friends, they all look up as you do. Jungkook immediately notices you and his eyes light up. He grins and waves at you, his friends also greeting you.

You walk into the library and immediately spot him sitting with a few of his friends. He's wearing his glasses, his hair is slightly messy, and he's intensely focused on his textbook. You walk over to him and stand next to him.