I never said he was an innocent person. Nobody thinks he is a good guy but the consequence Mk got here is long overdue. It's just tiring to see people going constantly "my poor baby" for Mk. Is Mk really that "innocent"? no right? Also I don't want to sound too hung up on the semantic but Mk-Sun were never exclusive. They were "sorta" seeing each other as the story tells us. So rather than cheating, it's going behind Sunhwa's back and deception.
Well we all know that Mokyeon is a toxic asshole and so is Sunhwa, as you said they were just fuck buddies and preferred autonomy more than anything else. See the same can't be said for Nanjo, I agree that he's definitely the better of the bunch but that's it. We all know that Nanjo wants to treat his partner "right" and he definitely sees his relationship with Sunhwa a real one, Sunhwa's inclinations aside. Let's not argue the fact that, he deliberately chose to fuck Mokyeon just to "save" Sunhwa bc he was under the delusion that Sunhwa is an innocent babe, who is being exploited by Mokyeon. That's what we refer to as cheating by all accounts.
Did mok force nan into fucking? Did he force sunhwa into the threesome thing? Who was the one cheating on sunhwa? Who used to not believe mok exposing that twink? His savior complex is blinding him, leading them all to this situation, after knowing the whole truth he is still chasing sunhwa like be fr!!!!? If not savior complex what is it? Naturally dumb?
To word it properly, nanjo prefers CHEATING on sunhwa— the person whom he believes he's in a genuine relationship with— by AGREEING to mokyeon's offer inorder to "save" sunhwa, OVER communicating with him and resolving the issue with mokyeon. But ofc, we all see that mokyeon as the complete villain here. It takes two to tango.
I already agreed he has savior complex. I just want to ask how does any of this is in the same scale as Mk's obsessive and unhinged behavior? How is engaging in a threesome the same level as fucking your partner till passing out and then keep going screaming at them to wake up? how did his savior complex influence Mk to want to sleep with him? Isn't that just Mk using Nanjo's savior complex to his advantage? Did I ever say Mk forced Sunhwa? where did this come from? Nanjo chasing Sunhwa should not harm Mk in any way. Js because Mk likes Nanjo does not mean his savior complex is all gone. Again how is this any relevant to the question I asked? All of them are wrong but one of them is objectively worst of the three.

Nan you did nothing wrong that's how deal with pos mok you deserve sm better than fugly ass mok and that twink.