Rightttt he might be demisexual with a preference for men or idk
They had no deep emotional connection in the beginning. He has primary sexual attraction towards an attractive person of the same gender even though he is straight. It just means the specific person he’s drawn to is a unique attraction within that broader category. I mean we have to let people have their orientations because it is such a difficult and ever changing thing. I mean these stories have us believe that these straight guys get with the gay guys and they stay with them till the end of their days which is perfectly fine, but even if they do, it doesn’t erase the fact that they can still like dick and pussy at the same time even if they aren’t getting any.
Also, he doesn't think he's gay bc he found jungyoon attractive immediately, but has never had interest in any other guy. There are many types of sexuality out there.