
I'm not hating him because he had a relationship in HS, no I'm saying that he already B or gay whatever, he was like that since a long time, so why was he so shocked as if he was straight, and also if he in a relationship he should refuse the other one probably and stop leaving the matter like that ( ̄へ ̄)

I don't think he was shocked, or acted shocked as if he was straight. I think he was disbelieving that the kid was STILL being persistent in his annoying puppy love, and he was trying to reject him and get him to give up. Which is totally fair enough. He had no idea Puppy Love already knew he was okay with guys and didn't want to out himself to the kid, which is also totally fair.
Come on guys, you can't expect uke to fall for the the seme this fast. Do you guys want him to be easy? Ya'll hate him for having sex with hanjun even tho he was married, but we don't even know his story yet. Maybe he thought he wasn't ready to accept being gay or maybe he's bi and actually liked his ex-wife but maybe she found out he was gay/bi, WHO KNOW JUST STOP HATING. LOL