a) I find it implausible that Seju speak of their relationship with Sumin sleeping on Sunji knees ....
b) Sunji would have to ask Sumin explanations after the revelation of Seju about their relationship
c) I'm not surprised about Seju , although I hoped that she turns out not so bitchy
d ) Sumin has disappointed me most of all . (I never liked that she would accept all those gifts) Already from the previous chapter: She is finally closing with Seju, even if she love both , she was not to give in to the advances of Seju . She not had to do this to Sunji.
e ) Seju is manipulative , but it is enough to justify Sumin , must finally act in a mature way
Ps. Like everyone else, even if I'm not particularly surprised , this chapter has left me disappointed...