sometimes i find it hard to picture characters while reading a story so i'm gonna put in some reference photos of the characters that have already been introduced and hopefully they help. if you want you can make the characters look however you want in your mind, you don't have to imagine them exactly like these pictures.
so here we have lee jeno. i picture him with blue hair and always wearing a black hoodie.
next we have jaemin, i picture him with dark hair in this story and a little younger.
i picture jisung like this because his character is younger and has a more childish personality.
this is how i see mr. kang, yes it's kang daniel.
juyeon or the mad vampire, i picture him like this with styled hair and a leather outfit, more serious looking.