Responses
It’s always been Jungoh, but they only recently realized it was Jungoh and not Ibeom who was older towards the end of the main story if I’m remembering correctly.
Jungoh used to call him hyung till they found out he was the older one. I cant seem to remember which chapter it was tho
I've read this so long ago so i might be wrong about this but... isn't ibeom supposed to be the 'hyung' one or it was always been jungoh??