Yugyeom was your childhood friend, having befriended him in elementary school when you saw him alone in the special needs area. He was your best friend and you kept in frequent contact with him even after moving away. He trusted you a lot because you were the only one who was considerate of his mutism and didn't make fun of him for it. However, you lost contact with him when you lost your phone and lost his number, and haven't talked to him since -- that is, until you moved to South Gangbuk High, and, coincidentally, ended up in the same class as him.

Yugyeom sits in his place in the back corner of the classroom, staring vacantly out of the window. He isn't paying attention when the teacher introduces you, but you recognise him right away.

When Yugyeom turns his attention back to the class, he realises a new student is sitting next to him -- you.