No shade, I think you need to read it again then.
And beside just because he broke up with his lover, doesn't mean he's the better choice. That was his decision and the guy is such a douche bag anyways. Looks how easily he dropped his lover and played down their relationship like it was meaningless. Who's to say he won't do the same to the MC?
Let's get one thing cleared up: Ahjussi did not sleep with that woman. And even if he did, it's irrelevant right now because they haven't established an exclusive relationship or talked about what they want their relationship to be. Hyeon Woo on the other hand, lead Eui Joo on by asking him to wait when the latter confessed. When Eui Joo found out about the girlfriend, he already wanted nothing to do with Hyeon Woo, who still forced a kiss on him. Just because Hyeon Woo broke it off with his girlfriend doesn't mean Eui Joo has to accept him, bearing in mind Eui Joo now knows how much of a sleazebag he is (a cheater and potential predator). If Eui Joo told Ahjussi he wanted to be exclusive and Ahjussi slept with someone else yet Eui Joo still accepted him, then you could compare. As @miptaetae said, you're comparing apples to oranges.
Did you understand Korean when you read the raws? Because spoiler
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Eui joon also asked to end the relationship with ahjussi due to the lipstick stain in the next chap. But because he promised ahjussi to have sex before he know about the lipstick they came to an agreement to have sex one last time before they go their separate path. The sex scenes probably is ahjudsi way of seducing euijoon so he won't leave.
Doesnt matter if he sleept or not he dont know this. And he rejected the one he loved all this time just like that but okay with the fact that seeing something that proof to him about ahjussi still sleeping around. It was what made me annoyed and i think it isnt a big matter to be annoyed or not seeing this much essays. People just biased when seme is hot thats all. You guys trying so much for a manga character. You dont have bother to answer to me because i really dont care
So you are telling someone comes to you after breaking up with their lover for you but you dont care. But oh well someone sleep around and with a lipstick in his face comes you are ready to go under him. I dont know why author doing. This is opposite to each other and annoying.. . .