i think u might already know this by now but, the red-eyed is nux. nux can copy others appearance because it is one of the abilities of it. the nux can change over some time and next time jooyoung is really gonna be the new nux. (but, I'm not sure abt this one, i was confused too and i probably forgot everything so don't believe this before reading😸).and "jooyoung" is the one with the normal eyes.