Kyungsoo hadn't known.

There had always been something wrong with him. He'd always been different in ways that he knew weren't right.

Minseok was wrong in every way. Minseok knew what was wrong with him. Minseok was wrong but every one thought he was right.

Nobody thought twice about Minseok, the new student. Nobody but Kyungsoo.
A game had suddenly begun, and there was going to be a winner.

Kyungsoo hadn't known.

Minseok had.