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The end of this it's clear. Sumin will break with Sungji when things got serious between them because of fear of breaking his dynamics of shallow relationships and getting hurt again. That and Seju, she wouldn't dare leaving Seju behind even if she's not happy with her.
So she will go back to Seju like always do, and she will really have to choose: Seju or Sungji. She will talk with Seju and they will end in good terms, but they would end, and Sumin would have to fight to get Sungji back, really a change for her, because she's not used to put very much effort into things. Really obvious, anons.