
Taeha is a red flag, so is Mincheol. Sure, circumstances changed him, but they changed him for the worst or they showcased and exposed his misogynistic, abusive side, like all the men.
Haesoo suffered because of him for 13 years. He abused her, and people, especially and mostly women, shouldn't think twice when their partners and ex partners were and still are abusive.
Micheol is your typical man profiting off patriarchy, and honestly speaking, your comment is harmful because it exposes a certain mindset that unfortunately lots of women have which harms women.
I am not implying that you're a pick me or sexist, but it's preferable to not empathise with the abusers

Girl bffr. Let me summarize what you said: mincheol was a good man! But he changed cause of the miscarriage and took loans! Meanwhile taeha is a psychopath devil!!”
Btw the story has not said clearly when and what the exact reason mincheol changed, that’s just your assumption. And even then, the FL having a miscarriage isn’t an excuse for him to become garbage?? If anything, that should’ve been a reason for him to be even more supportive but no- he made it all about him instead. I also wanna point out that you only brought up him taking loans instead of the blatant cheating, verbal abuse, emotional abuse, and hints of physical abuse in the past from him.
The reason why ppl don’t usually bring up taeha is because anyone who read the first couple of pages knew what they were getting themselves into by having a yandere ML. Every reader signed up for that kind of ML, so it’s dumb to have complaints about it. And wdym by purposely making her jealous? She’s the one who wants to keep their relationship as fuck buddies and doesn’t want to put a label on it. She wants to push him away 24/7, so in return he wants to push her to admit her true feelings and confess.
To see everyone hating on Mincheol so much you see unexisting red flags everywhere when Taeha is the one actually acting like a psycho in the beggining of his relationship with Haesoo. Mincheol fell for Haesoo, he loved that she was of the same background as him, he worked hard and helped everyone around him, he was a good man. Yes, people change when situations change, and we were shown exactly when he changed, it was when Haesoo had a miscarriage and she couldn't get pregnant anymore. Turns out he wanted a family more than a wife so he took his anger out on Haesoo, started gambling and taking loans he could not afford. But in the beggining he was good and his spirit got broken in the process, he changed, people change when situations change. No, they do not "show who they always were", people really change, I have seen and I lived it, life changes you.
Now, have you seen Taeha? Lying, manipulating, playing with Haesoo's feelings, purposely making her jealous and anxious so she would drag to his feet cause he wants her to be desperate for him, you can't see a red flag there? If with Mincheol it ended badly, can you imagine how it would end with Taeha? Mincheol is a cheater, but Taeha is a complete psycho. I hate Mincheol but c'mon, Taeha is just another kind of devil, not better but different, just a loyal devil, that's why girls love him.