Well, if Seju's father dies, it will put Seju in a more difficult situation.
That's what I'm afraid of, since if google translate is correct, the father's condition is not so good. Also a few chapters back, during the marriage interview, Nammi spitted out that Seju is into female, so that means that her family might now know that she is gay and might be taking advantage of that to tie her down and force her to get into marriage. So she's pretty much in a tight situation right now and if the father dies, she's screwed (hopefully not though)
I dont know why people hate Seju so much for a stupid mistake she made and regretted for 10(?!) years. Team Gaji didnt even portray anything evil she did. She ran into Sungji at Sumin's apartment and she has left them alone since then. She gave Sumin expensive gifts (and jobs?!) and unconditionally waited for her after her every break up. It's like she tried to give Sumin her everything that she could think of. Poor beautify pink hair lady. This time you might be waiting in vain because no one would be stupid to leave Sungji.
I agree with all of this, even the last part although it breaks my heart.
What I would hate though is if Team Gaji suddenly turns Seju into some kind of psychotic villain.