The story has some plotholes (they might be translation mistakes), but remember what su-ah's sperm does in him, he can resist alpha's pheromones (aka, he doesn't smell them)
Okk got it
well he usually would've smelled it but when Su-ah had sex with him and came inside of him he had a large amount of Su-ah's sperm that he just couldn't smell others pheromones, if they didnt have sex and Juhyeok just absorbed Su-ah's sperm (rubbing it on his body) then he would still smell some pheromones
Wait y can't he smell that moytherfucking alpha's pheromones??? Willpower to resist or?( genuinely asking) Also pls Juhyeok be safe, my baby