korean language uses gender neutral pronouns so it's probably just translation issue.
maybe he hasn't come out yet...
It's because he thinks he is a beta and "normaly" betas have heterosexual relationships in omegaverse
Remember nobody knows he's omega he thinks he's beta and betas seem to be in straight relationships so he just assumed.
Yea what you said. I commented before I saw that you said the same thing
Um if he’s dating a guy why does he assume Uke is into a girl? The heteronormativity is so annoying in abo stories