sia ue
Maybe, you could write down what was happening there?
in ch26: Seju went to Sumin's house, where she tried to talk to her before Sumin slapped her and pushed her and had the shrank almost falling on them.. she tried to explain, Sumin pushed her again verbally and physically and cut her sentences.
in ch27: Seju visits Sumin at the hospital, apologises and insists on taking responsibility for everything even if Sumin didn't need it, promised to wait until the day she dies, again Sumin rejects everything Seju would say.
.....
Seju had stopped wanting to be in a real relationship with her again
it is again Sumin's doing, in ch50, the dream Sequence, as she went to Seju's right after she broke up with the other girl, she told Seju: don't delude yourself, we broke up a while ago.. she was so bad in bed compared to you. <-- it was Sumin who decided the direction of the relationship compined with Seju's fear of being left on.
...
what we were talking about, Seju did try to convince Sumin to forgive her.. and worked harder than Sumin to Sungji