See?

no he didn't, he wasn't even aware that yejun was there by the time doyoon was having he's rut, if i recall correctly,
it's just my opinion but i think doyoon is only maybe trying to protect the kid from he's father, knowing both of them have the same second gender

I think he does remember. And knows it’s probably his trait that changed a beta to an omega.

yeah he does remembered, but at the time he was having he's rut he wasn't aware it was yejun he slept with, the reason yejun became omega cuz doyoon always showered him with alpha pheromones member what they're old classmates told yejun at the restaurant was it, he was still beta back then i mean yejun so he wasn't also aware of that, that's why he's totally shocked when he's told bout that pheromones shower thingi, my pov

┑(￣Д ￣)┍

I meant he was aware during his rut who he was spending it with. Hence the bite. His flashback showed he harmed the omegas his father brought because he didn’t want them. So basically no one can use his rut to control him in any way. He had full knowledge of what he was doing exactly when he was doing it.

well that's you're pov it's up to you