
It seems obvious to me that she looks down on him, just like yoonchae did. She does it a lot more openly, showing it on her face when she visits his place. Not supporting him when he and other workers protest for permanent contracts. Asking him to go for modelling instead of janitorial work, especially since we know he was never ashamed of his job. She hasn't done anything bad, but that doesn't mean she is good to him.
The only consolation is she isn't much older than him, the way yoonchae is. In any universe, a 34yr old getting with a 20/21 yr old is 'technically legal', but very icky.

I would like to respectfully disagree. He is 21 ish if i'm not wrong, his parents have been dead for very long, and he is very fragile and needy. He wants to be loved, and he is barely legal. I blame Hyemi and the FL who see all of this and take advantage of him. Neither of them truly love him, they want him for what he can offer them. The FL wants to defile him and use him because he is so innocent. And hyemi wants a good-looking boyfriend but not willing to support him in his circumstances. Wants him to stop protesting to keep a job he is happy in, a place he has earned on his own. She wants a status symbol, she doesn't want him. And neither of them see him for the exceptionally fragile, barely adult he actually is.
Inversely, a 34 year old man getting into a relationship with a 21 year old who has no support of friends/family will be very frowned upon. Same deal here.
The only one I feel bad for is Taejae. So young, and led around and taken advantage of by so many. Instead of truly atoning her wrongdoings, Yoonchae is still all 'my guilt, my wants, my behavior'. She has no guilt about hurting him, she isn't truly repentant yet