Responses
Yes, Sa-young already knows. In the next chapters and so------
- he'll reveal to J that he's the kid he saved, with proof too. He doesn't intend to keep it a secret for long, I'm assuming he just wants to prove it with evidence so J won't doubt. And an even better scene----
- temple kiss from Sa-young

IM GONNA SERIOUSLY CRY ATP so let me guess he went in the rift, sayoung was named in the meantime but because he got stuck in there he didn't know and jungbin made sure to erase all evidence for some reason after sayoung awakened? and thats the reason why his eyes "act up" as said in previous chapters because its probably not fully healed? or maybe he's using an ability to maintain his sight/body intact? i might be just spouting bullshit but that's what im getting kinda