About Mari

But also consider the fact that she was dating a married man so either way it's only fair to say that she doesn't really have a right to be mad.

Well, yep, you can't take her anger that seriously when she said she would devote her entire life to making Junyoung miserable... That she'd steal all his lovers, men or women... Lol, that kind of dedication is almost admirable. What if Junyoung dates people she doesn't find the least attractive? ...Her tantrums are starting to become funny as hell.

I get that she's mad about that and when you think about it from her point it view, what Junyoung did was wrong. But to be mad to the point of threatening to steal every single one of his future lovers is just insane. It's creepy and stalker-ish. You can definitely see that there's something wrong with her.

She's not a saint, and Junyoung remarked upon her flaws as well - she's supposed to be a flawed character. But this has absolutely NOTHING to do with her and Junyoung's relationship. It's not relevant to their trust in each other as friends. This is something Junyoung was aware of before, too.

I disagree. If they were in a stable relationship and he wasn't married then this would be a big deal but considering that all he did (actually not cuz he dated her brother) was a help to destroy a messed up a relationship.

Yep she can be mad, but no where near to this point considering the situation.

I think you haven't really addressed my point here.
To clarify once again: Junyoung knows about Mari and her relationships with married men from the get go - and he doesn't care. They are still friends, this matter doesn't affect their relationship. Things are initially neutral between them, at 0. This is known, Khaleesi.
So naturally the above isn't an excuse to disregard or simply brush off something that has been done that harms their relationship - aka Junyoung going out with what he thought was her boyfriend. This puts them somewhere below 0, and Junyoung initiated it. He is responsible for the cause which grinds a gear between them. Again, this isn't really something debatable, it's simply how things have actually progressed.
It may have been a misunderstanding, but only really on Junyoung's part. If Shihoon and Mari had actually been together instead of being siblings, it wouldn't have made a difference for Junyoung - this is what he always believed, and he acted knowing only THIS.
Now, you can debate how bad you think going out with your best friend's partner actually is. I personally would be very upset with my friend, but maybe you wouldn't be?

I don't think you understand my point. What I'm saying is that she should consider the context and not be mad to this extent. I'm not saying that she should brush of what happened.

I wouldn't be that upset at my friend and act like a crazy person. I also wouldn't date someone who was married and expect them to be royal to me while they are cheating on their wife.

You can respond to me again but frankly, if you're not considering the fact that mari was dating someone that was married (doing something even worse than what her friend did) and thus she doesn't have that much of a right to judge someone for that (she does have a bit of a right to do so but that's only because they were friends) I don't think we will get very far.

Like I said, the fact that she dates married men (which btw is the fault of that very man more than hers, he's the one who's made a promise, a commitment, and is breaking it, not her) is something Junyoung already is well aware of and accepts. This is the basis of their friendship as we know of it in the series from the start.
So what I don't get is how you won't even humour the notion that this is something between them as friends, and that it doesn't have anything to do with what they do outside of their friendship.
All I'm hearing is you babbling about some morals, and I get that you, well, have them. I just don't see how YOU think it's relevant to Mari's and Junyoung's relationship when THEY don't.

Not really, it's both her and his fault equally.

Well, would you rather break up the relationship between your friend and some guy who is loyal to her and doesn't have anyone else or some guy who has a wife and children? This is both between them as friends and other people. You have to consider or the factors or you're not making a judgment based on the full picture.

I don't think the first thing the potential partners that Mari meet says is "Hi, I'm married," and it's not my impression that she goes after them because they are married in the first place. If we consider this, Mari would then just be meeting a guy, while the guy who is married has already decided to be unfaithful. Even if you say that she already knows, she's already been scolded by the latest ex-wife regarding this, her flaws has been remarked upon and exposed in front of both her brother and Junyoung - that she's just an attention-seeking princess that wants to be pampered.
There's no question that she's done wrong, but Mari also has a right to be angry. While actually going through with her spoken revenge would be too much, she's probably just venting, wanting Junyoung to be punished somehow, as well. We don't know the outcome, so we can't really judge it yet.

You said this before: "the fact that mari was dating someone that was married (doing something even worse than what her friend did)", and I can't help but think that you must have forgotten how Junyoung is actually guilty of the same thing. He thought all along that Shihoon was married and had a family, but also had a lover in Mari, and still went through with it. So Mari can't possibly be worse than him when he first did something equally bad - the exact same thing - AND betrayed his friend.

Of course there's a bigger picture, but how is all that relevant when what we're trying to look at and judge here is the relationship between Mari and Jungyoung? It's not a pissing contest between them of who did the most bad things. We only NEED to look at things that are relevant to and have an impact on their relationship.

Let's just agree to disagree. I would read your whole reply but I'm tired and I think we will just end up repeating the same things over and over again.