Why not ?
Are you referring to Jun and the one that is now his current lover? Cause if you are, I can understand why you don't like the idea. I dislike the guy. He definitely comes off as a massive jerk.
If you are thinking Jun and Rin, then I seriously doubt it. I cannot see either of them allowing themselves to be forced into a heterosexual relationship with ANYONE else, let alone with each other. It would take what is a comprehensive, sincere look at being LGBTQ+ in a country that frowns upon LQBTQ+ people and turn it into a slap in the face of the LGBTQ+ community.
If both of them were terrified of letting anyone know, and terrified of following their hearts, it would be easier to see that happening (as that does happen in real life). But seeing them as they are now (strong and determined to live their love lives happily as they see fit), it would go too much against their characters.
i doubt they’d end up together since this story is about the struggles of realistic lgbt members. im sure it’ll dive deeper into it later on.
My gut is telling me that they will probably end up together and i don't like that