oh wow jesus uuhmmm… i’ll begin by saying i do not see how jisung could be seen as too straight (because of reasons too long to explain) so we’re already off to a bad start.. but as for miso to me they do things that someone would only do or say to their (romantic) partner like going out togehter alone to places known to be dating spots for couples, introducing eo to all the important people in their lives (when they haven’t done that with any other member eg), spending romantic holidays together, spending time with each other more than anyone else, and even if they’re with other people like on schedules they still find a way to be alone togehter away from everyone else because they just like eo that much, the fact that both always say they’re each other’s soulmates even after all these years, that they’re fated, that they’re one, etc, also the way they met ((jisung asking about him as soon as he saw him because he was too beautiful (love at first sight imo), and then being inseparable only after a month until 7 years later)), the members themselves saying they’re inseparable, saying that they look like a couple, that their relationship is secretive, that they have their own world that not even they want to interrupt, etc, the list really is endless…. i hope this helped but you might have to recheck that gaydar first my friend JDKDJDKJ😔❤️