I do think the twin doesn't know hajin. I've said it before, unless it's like the plot of the prestige ( the movie with Christian Bale and Hugh Jackman) , even if they were twins, unless it's the same twin from the flashback it would be impossible for him to know all the little things that make hajin tick. I still think hangnyum is the same guy from high school.
Wait, I'm really confused. How'd you know the twin has a girlfriend?
I don't think he did tho, they mentioned the women having a boyfriend but from the way it's phrased it sounds like a different dude
The twin hajin met in high school was hangyum but the twin who went to school at the same time as hajin is the twin we haven’t seen yet. Maybe hangyum wasn’t in school for whatever reason but liked to sneak onto campus and pretend to be his brother. I have a feeling the other twin doesn’t really know hajin. I know bisexuality and pansexuality exist but if unknown twin was the one in high school who flirted with hajin i just get the feeling he wouldn’t have a serious girlfriend lik he does now. Anyway I could be very wrong since I can’t really remember the high school flashbacks that have happened so far lol