Yesss also remember he was gonna do sports science or something but got injured and changed his major? And Haneul doesn’t know about it, I think Haneul has been kept in the dark about a few things
Rightt... Plus, I remember that Mincheol mentioned something about not recognizing who the lady was. Sometimes, it's a kind of a coping mechanism to forget about the people who's involved in an incident that has caused you trauma. The girl might be involved as well. (This is just me overthinking.)
I don’t know if he knows her but my theory is that she was a classmate that happened to hear/ see what Mincheol is trying to hide from Haneul without him realising and embolden by this she’s now being a sly bitch (also me overthinking)
I think there’s more to it than what meets the eye.
Mincheol might be ignoring Haneul because of a one particular incident of the past. In chapter 40, the lady (can’t remember her name) says something about Mincheol being shameless for still being around Haneul. Haneul has a scar on her wrist, which she covers with a wrist band (is that what you call it?). From several chapter before, Mincheol was smiling—watching Haneul, who was peacefully sleeping—that is, until, his eyes landed on the wrist band, then the mood turned dark and gloom. With that in mind, Mincheol might have something to do with that.
Why does Haneul have a scar on her wrist?
Why is Mincheol so afraid of giving in to his desire to be with Haneul?
Why did the lady planted this kind of situation?
From the evidences so far, Mincheol might be (or not) the reason for Haneul's scar. He might not want to be with her because he's afraid the Haneul would get hurt again because of him, or he might've done something that caused Haneul to hurt herself. Either way, the lady definitely knows the reason, and she's probably plotting something.
Again, don't hate Mincheol.